I upgrade my computer ( 2010 13') to the new os x 10.9 and ...

i upgrade my computer ( 2010 13') to the new os x 10.9 and now i want to go back to my old os x lion 10.7.5 because the new os x doesnt work well with some of my softwre now i tried to download my older os x lion but it show me an error and i dont know what to do .
just for you know , i purchase the os x lion and i really want to use it again untill my softwer can work with the new os x
pls do this fast , i am working with the computer and i stopped because of this.
<Email Edited by Host>

You need to fully wipe the HD (including the recovery partition) to remove all hints of any newer MacOS version that has been installed on that computer.
Since you still aren't providing any details wiht the error message you are getting when trying to re-download Lion the best answer anyone here can give you is to call Apple and order a replacement set of the original discs that shipped with the system when it was new. To be honest, this is really the only answer we can give because the license agreement for the Lion purchase you made does npot allow you to install it on a machine that you no longer own, so if you install it on the machine you are selling or giving away, it would be in violation of the license agreement of the OS purhase from the Mac App Store.
You an always wipe the HD of the Mac you are selling/giving away and let the new owner contact Apple to purchase the orginal OS install discs, and you now have your answer "fast". They may have to wait, be in either case, someone will have to wait until the discs are purchased from Apple (unless you can find the ones that came with the system when you originally bought it).
If the original system is new enough that it came with Internet Recovery, then you should wipe the drive and let the new owner go through the steps to download and install the OS (using their own Apple ID) and there is no waiting there at all.

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Before buying a second-hand computer, you should have run Apple Diagnostics or the Apple Hardware Test, whichever is applicable.
The first thing to do after buying the computer is to erase the internal drive and install a clean copy of OS X. You—not the original owner—must do that. Changes made by Apple over the years have made this seemingly straightforward task very complex.
How you go about it depends on the model, and on whether you already own another Mac. If you're not sure of the model, enter the serial number on this page. Then find the model on this page to see what OS version was originally installed.
It's unsafe, and may be unlawful, to use a computer with software installed by a previous owner.
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a. If the machine shipped with OS X 10.4 or 10.5, you need a boxed and shrink-wrapped retail Snow Leopard (OS X 10.6) installation disc from the Apple Store or a reputable reseller—not from eBay or anything of the kind. If the machine is very old and has less than 1 GB of memory, you'll need to add more in order to install 10.6. Preferably, install as much memory as it can take, according to the technical specifications.
b. If the machine shipped with OS X 10.6, you need the installation media that came with it: gray installation discs, or a USB flash drive for a MacBook Air. You should have received the media from the original owner, but if you didn't, order replacements from Apple. A retail disc, or the gray discs from another model, will not work.
To start up from an optical disc or a flash drive, insert it, then restart the computer and hold down the C key at the startup chime. Release the key when you see the gray Apple logo on the screen.
c. If the machine shipped with OS X 10.7 or later, you don't need media. It should start up in Internet Recovery mode when you hold down the key combination option-command-R at the startup chime. Release the keys when you see a spinning globe.
d. Some 2010-2011 models shipped with OS X 10.6 and received a firmware update after 10.7 was released, enabling them to use Internet Recovery. If you have one of those models, you can't reinstall 10.6 even from the original media, and Internet Recovery will not work either without the original owner's Apple ID. In that case, contact Apple Support, or take the machine to an Apple Store or another authorized service provider to have the OS installed.
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If you already own another Mac that was upgraded in the App Store to the version of OS X that you want to install, and if the new Mac is compatible with it, then you can install it. Use Recovery Disk Assistant to prepare a USB device, then start up the new Mac from it by holding down the C key at the startup chime. Alternatively, if you have a Time Machine backup of OS X 10.7.3 or later on an external hard drive (not a Time Capsule or other network device), you can start from that by holding down the option key and selecting it from the row of icons that appears. Note that if your other Mac was never upgraded in the App Store, you can't use this method.
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          You're booted in Recovery mode (that is, not from a 10.6 installation disc)
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e. Run Software Update and install all available system updates from Apple. To upgrade to a major version of OS X newer than 10.6, get it from the Mac App Store. Note that you can't keep an upgraded version that was installed by the original owner. He or she can't legally transfer it to you, and without the Apple ID you won't be able to update it in Software Update or reinstall, if that becomes necessary. The same goes for any App Store products that the previous owner installed—you have to repurchase them.
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a. If the original owner "accepted" the bundled iLife applications (iPhoto, iMovie, and Garage Band) in the App Store so that he or she could update them, then they're irrevocably linked to that Apple ID and you won't be able to download them without buying them. Reportedly, Mac App Store Customer Service has sometimes issued redemption codes for these apps to second owners who asked.
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c. When trying to create a new iCloud account, you might get a failure message: "Account limit reached." Apple imposes a lifetime limit of three iCloud account setups per device. Erasing the device does not reset the limit. You can still use an iCloud account that was created on another device, but you won't be able to create a new one. Contact iCloud Support for more information. The setup limit doesn't apply to Apple ID accounts used for other services, such as the iTunes and Mac App Stores, or iMessage. You can create as many of those accounts as you like.

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I upgrade my computer ( 2010 13') to the new os x 10.9 and ...

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