HT1338 upgrading leopard?

I am trying to upgrade my computer from leopard to something earlier so that it can sync with my iphone, is that possible?

Upgrading to Snow Leopard, Lion, or Mountain Lion
You can upgrade to Mountain Lion from Lion or directly from Snow Leopard. Mountain Lion can be downloaded from the Mac App Store for $19.99. To access the App Store you must have Snow Leopard 10.6.6 or later installed.
Upgrading to Snow Leopard
You must purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mountain Lion if your computer meets the requirements.
     Snow Leopard General Requirements
       1. Mac computer with an Intel processor
       2. 1GB of memory
       3. 5GB of available disk space
       4. DVD drive for installation
       5. Some features require a compatible Internet service provider;
           fees may apply.
       6. Some features require Apple’s MobileMe service; fees and
           terms apply.
Upgrading to Lion
If your computer does not meet the requirements to install Mountain Lion, it may still meet the requirements to install Lion.
You can purchase Lion by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
     Lion System Requirements
       1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
           or Xeon processor
       2. 2GB of memory
       3. OS X v10.6.6 or later (v10.6.8 recommended)
       4. 7GB of available space
       5. Some features require an Apple ID; terms apply.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
     OS X Mountain Lion - System Requirements
       Macs that can be upgraded to OS X Mountain Lion
         1. iMac (Mid 2007 or newer)
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer)
         3. MacBook Pro (Mid/Late 2007 or newer)
         4. MacBook Air (Late 2008 or newer)
         5. Mac mini (Early 2009 or newer)
         6. Mac Pro (Early 2008 or newer)
         7. Xserve (Early 2009)
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
     Am I eligible for the free upgrade?
         See Apple - Free OS X Mountain Lion upgrade Program.
     For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.

Similar Messages

Upgraded Leopard -- Snow Leopard; What About Boot Camp?

I upgraded Leopard on my iMac to Snow Leopard, and didn't even think about my Boot Camp partition. I guess I would have assumed the installer would have seen I had this partition and offered to update to Boot Camp 3.0, but when I checked last night in Windows, I see I'm still running Boot Camp 2.1. I ran Apple Software Update in Windows and wasn't presented with any Boot Camp updates.
What is the procedure for updating to Boot Camp 3.0?

Hi Mike,
the BootCamp Assistant in OSX is updated to version 3.0 !
To update the BootCamp Windows Drivers and the Control Panel insert the OSX 10.6 Snow Leopard DVD while in Windows and the update should start automatically.
If you have MacDrive installed in your Windows, you might need this trouble-shoot article to access the DVD http://assist.mediafour.com/index.php?a=knowledgebase&_j=questiondetails&i=55
Also a good idea befor installing the Driver Update is to make a backup of your Windows using WinClone or at least making a 'System Restore Point' just in case.
Regards
Stefan
Message was edited by: Fortuny

Can i upgrade leopard 10.5.8 to snow leopard

can i upgrade leopard 10.5.8 to snow leopard 10.6.

Yes, if your Mac has an Intel CPU and at least 1GB of RAM. Choose About this Mac from the Apple menu to check.
(83474)

How do i upgrade leopard to lion?

how do i upgrade leopard to lion?

First you would need to buy Snow leopard - call Apple to get an install disk. Then, since Lion is no longer availaable at the app store, you can place the order for that with Apple as well - they will email you a redemption code to use at the app store. So, you will need to install Snow Leopard, update it to the latest version (which includes the app store), and then go to the app store to redeem/download Lion.
But...... first make sure your machine meets the requirements:
http://support.apple.com/kb/HT4949
And, the 2 GB RAM mentioned are an absolute minimum - 4 GB would be a far more realistic minimum.

Upgrade leopard to snowleopard

to connect iphone with mcbook pro I need upgrade leopard to snowleopard - how can I manage...

Start by checking if you can run Snow Leopard:
Requirements for OS X 10.6 'Snow Leopard'
http://support.apple.com/kb/SP575
(NB: PowerPC applications can still be run in Snow Leopard using Rosetta, but they will not work in later versions of OS X.)
The OS 10.6 Snow Leopard install DVD is available for $19.99 from the Apple Store:
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
and in the UK:
http://store.apple.com/uk/product/MC573/mac-os-x-106-snow-leopard
When you have installed it, run Software Update to download and install the latest updates for Snow Leopard to bring it up to 10.6.8, or download the combo update from here:
http://support.apple.com/kb/DL1399
Check via Software Update whether any further updates are required, particularly to iTunes.
You should now see the App Store icon in iTunes, and you now need to set up your account:
http://support.apple.com/kb/HT4479
You can now upgrade to Mavericks OS 10.9 for free IF you have one of the following Macs, with not less than 2GB of RAM, and at least 8GB of available space on your hard drive:
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later), (15-inch, Mid/Late 2007 or later), (17-inch, Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac Mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
iCloud system requirements:
http://support.apple.com/kb/ht4759
If you cannot run Mavericks you can purchase the code to use to download Lion from the App Store (Lion requires an Intel-based Mac with a Core 2 Duo, i3, i5, i7 or Xeon processor and 2GB of RAM, running the latest version of Snow Leopard):
http://store.apple.com/us/product/D6106Z/A/os-x-lion
or Mountain Lion:
http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion

HT1338 Upgrading my OSX 10.5 Leopard

How can I upgrade my OSX 10.5.8 Leopard?

At the Apple Icon at top left>About this Mac.
Then click on More Info>Hardware and report this upto but not including the Serial#...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4
First you need to research all the problems people are having with the higher OSX versions, & make sure you have a bootable clone of what you have just in case.
then you must get 10.6 if they still have it, install it & update to 10.6.8 so you have the App Store to buy & download the huge 10.8 Installer.
Snow Leopard/10.6.x Requirements...
General requirements
   * Mac computer with an Intel processor
    * 1GB of memory (I say 4GB at least, more if you can afford it)
    * 5GB of available disk space (I say 30GB at least)
    * DVD drive for installation
    * Some features require a compatible Internet service provider; fees may apply.
    * Some features require Apple’s MobileMe service; fees and terms apply.
Which apps work with Mac OS X 10.6?...
http://snowleopard.wikidot.com/
It's been pulled from the online store & Apple Stores, so you have to call Apple to buy it, last I heard.
Call Apple Sales...in the US: 1-800-MY-APPLE. Or Support... 1-800-275-2273
Other countries...
http://support.apple.com/kb/HE57

HT1338 upgrade operating system from 10.5.8 to Snow Leopard

Hi
I have looked online and called a couple of stored to try and find the DVD required to upgrade my operating system but apple no longer seem to sell it and I am starting to run in to problems with newly purchased software. I even looked for the Lion USB but this seems to no longer be sold
Is there still a way of upgrading to a newer operating system so complete necessary software upgrades
Thanks
Tim

Forgive me being lazy but I wrote the following in reply to the post that preceded yours.
Aways keep an eye on 'More like this', the column adjacent to your initial post.   You will often find answers and positive leads to your questions there.
Upgrading to Mountain Lion.    Start by buying the Snow Leopard retail disc 10.6.3, then update to 10.6.8 via the combo updater >>>
Combo updater for Snow Leopard.      Mac OS X 10.6.8 Update Combo v1.1
Buying Snow leopard from Apple.        Last I read, you must call them (1-800-MY-APPLE). It is $29 plus tax for family pack and $19 plus tax for a single.     The disc is no longer available through a store.
Before you buy anything, first make sure your Mac is compatible.
Minimum specs for …     Snow Leopard. Mac OS X v10.6 Snow Leopard -          Read the Technical Specifications
Minimum specs for Mountain Lion. Apple - OS X Mountain Lion - Read the technical specifications.

HT1338 Upgrade path from Leopard 10.5.8

What is the cheapest way for me to upgrade from OSX Leopard 10.5.8 to a version supported by Apple?
The imac I have was purchased in 2009, is intel based and has 2G of RAM.

OS X 10.8 Mountain Lion is the current OS X and can be downloaded from the App store, which you can use after upgrading to OS X 10.6.
You may know that either Lion or Mountain Lion no longer run any PowerPC code. OS X 10.6 Snow Leopard is the last operating system that can run PowerPC code. People with Microsoft Office 2004 were surprised when it would no longer run under OS X 10.7 Lion. Newer versions of Office are OK. I have a dual boot iMac, with both OS X 10.6 Snow Leopard and OS X 10.7 Lion, as I have a few PowerPC programs I use now and then.
As mentioned above, consider upgrading your memory to 4GB for performance purposes if you upgrade.

HT1338 upgrade from leopard

How do I upgrade my software on my mac pro from leopard? can not do it via the cloud.

You'll need to upgrade to at least OS X 10.6.6 or later to access the App store. You already have an Intel processor and probably already have the 1GB of memory required for OS X 10.6. Call the online Apple store, which in the US is at 800-MY-APPLE to order OS X 10.6 Snow Leopard. Install, do Software Updates, and you'll be at OS X 10.6.8.
Your Mac Pro needs to be a 2008 model or newer to upgrade to OS X 10.8 Mountain Lion, and while the minimum memory is 2GB, 4GB is recommended. Once at OS X 10.6.8, and assuming your system can run it, you can buy and download OS X 10.8 from the App store.
If you can't run OS X 10.8, you can still buy OS X 10.7 Lion by calling the online Apple store. They'll send you a code to download it from the App store. OS X 10.7 has the same memory requirements and recommended memory at OS X 10.8.
One other thing to be aware of .... in both Lion and Mountain Lion, Apple dropped emulated PowerPC support, so if you currently run any programs with PowerPC code, they will no longer work. People upgrading with Office 2004 got surprised when it would no longer work.

Phones are unavailable for me. How can i upgrade Leopard to Lion?

The only thing stopping me from purchasing Snow Leopard is my self imposed isolation without access to friends or relatives who can make a phone call for me. It is my choice and hardly Apple's fault. I left upgrading to Snow Leopard until long after it was withdrawn from sale from the on-line Apple Store. Thanks to Klaus1 for enlightening me. He is a good friend.
I can hardly claim Apple should make a simple product already in existence available to me via the same methods much of its other products are at present, through their existing storefront in their existing website. I have no right to point out that this product is advertised with a price point and necessary in the path for upgrading to the most recent product Lion and is key to being able to purchase apps once that is functional with my OS.
But actually it falls under the jurisdiction of handicap access, and this problem is as always still an issue, not just for me, but many. It is not isolation that drives this query, but a demand for equal access.
It is not like a person makes a choice to lose hearing. I did not impose my difficulties, they are in fact my constraints. I do not own a functioning phone for obvious reasons. I am delighted to own an ipad. I am here fighting for the opportunity to upgrade my laptop using a method that has been available to me for years... i know it may be easy for ya'll to call but i cannot. I am writing all this to appeal for an intelligent response to solve my very real problem.
Who knows the best link or email where i can type a message and get support help... I have sent several messages in varying locations with no response as of yet.
Who has been on the phone call to get this upgrade, can you confirm what i have heard, that there is a link to purchase the product?
Maybe there is a support line i can mail a text to.
Please don't tell me to call or get a friend to call. This is not a solution, it is a way of skirting around the problem and it unfortunately alienates many people with a myriad of complex constraints who for whatever reason cannot use a phone.

test
EDIT: Sorry for the confusion, but there's a serious problem with the forums at the moment -- many posts don't appear for all users. Sometimes you must make a new post for the previous ones to show up.
That's why Klaus didn't see my post (and he meant a white disc, not black).
Long Haired Artist wrote:
The price point of $19.99 is advertised here:
http://www.apple.com/osx/how-to-upgrade/
I would not know the price if it were not advertised. Posting a price and intent to sell is advertising.
I suspect Apple's legal department would not agree. If you wish to pursue that issue, good luck, but this is certainly not the place.
I don't see how this is a policy issue. I see it as an oversight, and would like to have this thread available to others who share my situation of not having access to a phone.
It's clearly not an oversight. When Mountain Lion was released, and Snow Leopard was dropped from the online store, many folks complained. Only after a month or so was it offered by phone.
Again, back to my question, does anyone have any experience with the phone call, leading to a link, what is that link, or does anyone know a way to get customer service via email.
There are no public links or email for sales, only specific support sites, such as: http://www.apple.com/support/contact/
Message was edited by: Pondini

Problems after upgrade: Leopard to Leopard no longer works

My sister upgraded to Leopard on her iMac(c2d) to Leopard yesterday. Earlier in the day we were able to do video chats with a number of people(her machine Tiger to Fathers machine Leopard). However, since upgrading, we've experienced weird behavior for video chats. Basically in her window she won't see her image(the small one), and I don't see her at all. We've tested this out with a number of other iChat accounts and get the same results. Btw, all machines that are chatting with her are using Leopard. Also, all other forms/capabilities work: screen sharing, sharing of pictures, audio chats.
Anyone out there have similar problems after upgrading from Tiger to Leopard? I have done the usual adjustments of bandwidth and QT settings, as well as restarts. What else should I try?
tia,
n

I finally resolved this problem: I think the issues/steps would be helpful for anyone who experiences iSight off or not working problems after upgrading to Leopard(then to 10.5.1) on a intel 20" iMac :
Problem:
-If you have an internal iSight on an iMac and your camera works fine in Tiger
-If you upgrade to Leopard
-If Chat camera doesn't show your image (iSight off) even though the green light is on
-You can see the other persons video on iChat
-Your friends can here you and you can share screens, files, etc.....everything but have them see you
These are the initial steps I took:
- Deleted the pLists(or stored preferences for the Application) described at the top of this thread
- Was told it might be slow internet connection so did various things: disconnected other computers, changed wireless to "G" only
- Specifically Opened of ports spec'd for Leopard on router (even though I hadn't needed to do this under Tiger)
- Tried chats with various people on various fast/slow networks
- Restarted all aspects of the network: router, wireless access point, computer
- Checked to see if the iSight was shown in 'System Profiler'. It was found in 'About This Mac->More Info->System Profiler->USB'
- Clicked Video icon in iChat Buddies window(to the right of your name) and coudn't see my image
- Opened 'PhotoBooth' and coudn't see my image(black screen)
- Opened iMovie and couldn't capture video via the iSight(black screen)
- Opened iChat->Preferences->Video and couldn't see my image
- Validated that 'Camera is Enabled' in iChat->Video->Camera is Enabled
If you are experiencing a similar problem with you built-in iSight, I would probably focus on the last 5 things that I did. What they showed me was that the iSight was just not capturing video even though it was capturing sound in 3 different applications.
The solution to iSight Off or iSight Not Responding or No Video is......reset your computer! I had thought my sister performed this but it turns out she hadn't. Here's the link to this procedure:
http://docs.info.apple.com/article.html?artnum=303446
Very easy to do though: Power off computer and unplug all cables, including power cable for at least 15 seconds. Plug everything back in and power up the computer and retry clicking on the 'Video' icon next to your login name. If you see yourself then...problem is solved.
While I eventually found posts in several other forums, it took me the better part of a week. To try this simple step. I wish I had done so straight away. Oy. I guess I learned a lot about ports, speed etc.
I hope this helps.

Upgrade leopard to snow leopard with preexisiting snow leopard time machine backup

I was using an old desktop Mac that had been upgraded to snow leopard from leopard a few years ago. Disk utility said I needed to repair my hard drive using the installation discs. I didn't have the snow leopard installation disc but still had the leopard installation disc which I used. When the computer re-installed leopard onto my hard drive, it created a partition: one with my hard drive running snow leopard, and then a new one with the space left over, running leopard. I got my replacement snow leopard installation discs and would like to delete the leopard partition, and go back to what I had before with the snow leopard drive. I do have a time machine backup (somewhat incomplete) and am making a copy of the physical snow leopard drive. I cannot access the most recent time machine backup since I'm back to running leopard and the time machine backup was made under snow leopard. I'm not sure how to proceed from here to upgrade to snow leopard. When I try to upgrade to snow leopard, I'm asked which destination drive to use. I don't want to use the snow leopard drive, since it would get deleted. So, would the leopard drive be the answer in this case? And what would happen to the contents of my old snow leopard drive? Would I end up with two partitions, both with snow leopard, but one being current (nothing on it) and the other being my old drive? Would I be able to get rid of the current drive and then use only my old drive? Thanks in advance for any help.

First of all, it's unclear to me why you cannot select the old Snow Leopard partition.
I also think you should have been able to repair hard disk using the leopard CD disk without actually installing leopard OSX by using the Utilities only.
Also, Why is your Time Machine backup incomplete? Is that under Leopard or Snow Leopard?
Now you have two partitions with two different OSX (Leopard and Snow Leopard). Your goal is to get back to Snow Leopard.
I going to assume that the original Snow Leopard partition is inoperable (this is also question?) I would upgrade the Leopard partition to Snow Leopard. Afetrwards, use the Migration Assistant to bring in your data, documents, app, and settings. Once complete, you should be able to see your Time Machine backups. If all is ok then you can delete the original Snow Leopard partition.
This is a somewhat complicated situation, so I am issuing a caveat that is my opinion only. Wait until another expert provides input regarding your situation to determine the best course of action.

Start Up & Sleep Problem, considering graphics card upgrade, Leopard?

Hi All,
I've searched at length for this problem, and as a user rather than a tech have suspicions, rather than certainty.
Have been suffering with my Mac Pro going intermittently to shutdown rather than sleep for a while, I've been living with that. But a new problem has appeared just in the last day or so, I don't necessarily think they are connected, but what do I know?
The new problem is it seems for want of a better term my Pro stalls on start up, it took an hour before it started this morning, its really quite peculiar.
I hit the start button, initial whirring, then stop, the machine appears to be off, but after 10-20secs, it starts again, then immediately stops, and repeat, and repeat. Strangely though, eventually it starts to get further into boot up each time, maybe it gets to the apple logo, and shutdowns, and repeats, and repeats, then OS X loading screen, shutdown, wait 10secs restarts on its own, eventually it gets to the deskstop and shuts down, before running eventually. It started doing this yesterday, thought it might be because I've moved it a couple of times, connecting an ethernet cable, (awkward having the socket on the back!). So I checked everything firmly seated inside, and very carefully hoovered out the dust (although that wasn't bad).
Reset SMC, reset energy saver settings, ran the tech tool for the Apple Care disk, removed all my crucial.com extra ram, and inserted Apple's original heat sunked RAM, no change.
Anyway its running now and as you can imagine if this going to get worse or a hardware component is on its last legs I'm busy burning dvds of important files, its used mainly for video editing, but I reckon 15 dvds ought to get the important business backed up! As I'm going to book it into Apple as its under an Apple Care policy.
This has got me thinking, is it time to get some upgrades at the same time. No matter how much RAM I have installed, and it doesn't appear to use even half of whats onboard, I've struggled with Motion very slow, often crashing, especially when using HD or Pro Res HD video, so much so that I've stuck to Livetype, which is a shame as its limited, and limiting. I notice Livetype has been dropped FCS. If its not the RAM, is it the graphics card? I was thinking of upgrading Ati HD 3870, or better, but I'm unclear if these are only compatible with Leopard 10.5.x, hence considering upgrading to Leopard. And thought I'd get Apple to do the work at the same time.
As to the start up problem, if it were a vehicle I'd be thinking it was damp electrics, and be spraying WD40 to dry it out, I'm not of course, but I'm thinking power supply, or a temperature issue, but as its working when running 4 hours and working nicely now (so long as I don't leave to 'sleep') I can't see it being an overheating issue.
Anyway sorry to go on but thoughts/advice please?
Its business critical machine, as a videographer although I bought this MacBook Pro, from which I'm typing, for just this scenario which I'll use at a pinch.
Message was edited by: Northern Munkee

You may want to just get one utility for now.
At this point, do you need a new graphic card? then you need to upgrade to Leopard. If your software and system won't be a problem regardless of compatibility great, but make sure. Otherwise, Snow Leopard will likely require lots more upgrades and updates.
But maybe doing an upgrade to Leopard and then test the waters with Leopard and Snow L. makes better sense.
Only the "Early, Early" 2006-7 1st Gen Mac Pros can run 10.4.11 (or at least install and officially supported).
The product pages have misleading information but you do need 10.5.7 for the 4870 which is your best graphics upgrade choice. The 3870 came out a year ago and requires 10.5.3+.

Upgrade leopard to lion

Hello,
I have a 2006 Mac Mini with Leopard (10.5.x). Couple of questions:
1. Does Lion support this Mac?
2. I have purchased Lion for a Mac Book Pro I have. Can I upgrade the Mac Mini directly to Lion, or do I have to purchase Snow Leopard upgrade as well?
Thanks,
Yair.

If you have a Core 2 Duo processor then, yes, it will run Lion. If not, then you are limited to using Snow Leopard.
If you have Snow Leopard installed on the Mini, then you can log into the App Store using your Apple ID and download Lion at no additional charge. If you have the Lion installer application then you can make a USB flash drive installer for Lion to use on your computers. If you make a USB installer for Lion then you can upgrade the Mini without installing Snow Leopard.
How to Install Lion Successfully - You must have Snow Leopard 10.6.7 or 10.6.8 Installed
A. Repair the Hard Drive and Permissions:
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. Then select Disk Utility from the Utilities. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.3.) if DW cannot fix the drive, then you will need to reformat the drive and reinstall Snow Leopard.
B. Make a Bootable Backup Using Restore Option of Disk Utility:
Open Disk Utility from the Utilities folder.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the backup volume. Source means the internal startup volume.
C. Important: Please read before installing:
If you have a FireWire hard drive connected, disconnect it before installing the update unless you will boot from this drive and install the update on it. Reconnect it and turn it back on after installation is complete and you've restarted.
You may experience unexpected results if you have installed third-party system software modifications, or if you have modified the operating system through other means. (This does not apply to normal application software installation.)
The installation process should not be interrupted. If a power outage or other interruption occurs during installation, use the standalone installer (see below) from Apple Downloads to update. While the installation is in progress do not use the computer.
D. To upgrade to Lion:
Purchase the Lion Installer from the Mac App Store. The download will start quickly. Lion is nearly 4 GBs so a fast internet connection is essential. Download time could run upwards of 4 hours depending upon network conditions and server demands at the time.
Boot From The Lion Installer which is located in your Applications folder.
Follow instructions for installation.

Possible to upgrade Leopard to Lion without SL?

My Macbook Air has Leopard 10.5.8. Since OS X 10.7 Lion will be a Mac AppStore purchase, do i have to upgrade to Snow Leopard before i can upgrade to OS X Lion? Or will there be a way through Leopard?
Is it possible / legal to upgrade my MB Air using the Snow Leopard install discs that came with my iMac ?

Yes, buy the Lion DVD and install from DVD directly.

HT1338 upgrading leopard?

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