Went to upgrade and says OS too old. I went back to older version of foxfire. Now I have a circle with a line through it and when I try to open it I get,You cannot open the application "Firefox" because it is not supported on this architecture.

I have PowerBook G4, running 10.5.8. Went to upgrade and says OS too old. I went back to older version of foxfire. Now I have a circle with a line through it and when I try to open it I get,You cannot open the application “Firefox” because it is not supported on this architecture. Thanks for the help.

Firefox 3.6.x is the last available from Mozilla for PPC Macs. 
http://www.mozilla.com/en-US/firefox/all-older.html
For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/ 
http://tenfourfox.blogspot.com/ 
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported

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I downloaded Firefox 4 onto my PowerPC G4 1.67GHz running Mac OSX 10.5.6. When I try to open it I get error message You cannot open the application "Firefox" because it is not supported on this architecture. I can't find my Firefox 3.6.16 I'm on Safari.

I just want to download Firefox 3.6 again
I downloaded Firefox 4 onto my PowerPC G4, 1.67GHz running Mac OSX 10.5.6. When I try to open it I get error message You cannot open the application “Firefox” because it is not supported on this architecture.

Use Tony's suggestion. I am running it right now and it is awesome. I love Mozilla but they basically screwed all of those older Macs over. Come on Mozilla. These Macs still work, and there are plenty of people with them out there.

I am trying to install Firefox 4 on my Mac OS 10.5.8 and I get the error message "You cannot open the application "Firefox" because it is not supported on this architecture" Help!

I am trying to install Firefox 4 on my Mac OS 10.5.8 and I get the error message "You cannot open the application "Firefox" because it is not supported on this architecture" Help!

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html
Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com

I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

I just got a notice to update my firefox to 4.0 and when I downloaded the new software it indicated: that I can't open the application "Firefox" because it is not supported on this architecture. Any ideas about what might be wrong and how to fix it?

I just got a notice to update my firefox to 4.0 and when I downloaded the new software it indicated: that I can't open the application "Firefox" because it is not supported on this architecture. Any ideas about what might be wrong and how to fix it?

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

I've just downloaded 4.0 and now read "You cannot open the application 'Firefox' because it is not supported on this architecture" What do I do?

iMac G5 with PowerPC G5 (3.0). Is this able to support 4.0? Can I go back and run 3.6?

Please consult the Firefox 4 [http://www.mozilla.com/en-US/firefox/system-requirements.html system requirements].
If you cannot use Firefox 4 on your computer, you can download Firefox 3.6 from [http://www.mozilla.com/firefox/all-older.html here] .

Loaded upgrade and it wont open/You cannot open the application "Firefox" because it is not supported on this architecture.

downloaded your latest upgrade.
Running on mac os 10.5.8
Power PC G5 dual 2 GHz
8 GB DDR SDRAM

I suggest yo change you system requirements: This is what is advertised
Operating Systems
* Mac OS X 10.4 and later
Minimum Hardware
* Macintosh computer with an Intel x86 or PowerPC G3, G4, or G5 processor
* 128 MB RAM (Recommended: 256 MB RAM or greater)
* 200 MB hard drive space
Im running
Model Name: Power Mac G5
Model Identifier: PowerMac7,2
Processor Name: PowerPC 970 (2.2)
Processor Speed: 2 GHz
Number Of CPUs: 2
L2 Cache (per CPU): 512 KB
Memory: 8 GB
Bus Speed: 1 GHz
Boot ROM Version: 5.0.7f0
Serial Number (system): CK347009QEB
Hardware UUID:
SystemVersion 10.5.7 (121)
This is way above your so called system requirements
This has not solved the problem, but now forces me to use Safari

I running OS-10.5.8 and when download Firefox and try to open get "You cannot open the application "Firefox" because it is not supported on this architecture. You cannot open the application "Firefox" because it is not supported on this architecture."

The above is my question

Sorry, Firefox 4+ versions don't support PPC architecture.
For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/ 
http://code.google.com/p/tenfourfox/downloads/list
Or use Firefox 3.6.20: 
http://www.mozilla.com/en-US/firefox/all-older.html

While trying to open iPhoto this message coming-You can't the application "iPhoto" because it is not supported on this type of Mac

I recently upgraded my MacBook from Moutain Lion to Maverick.After upgrading I can not open the iPhoto.Whenever I try to open I get the message --You can't open the application "iPhoto" because it is not supported on this type of Mac.Tell me how to solve the problem?

To re-install iPhoto
1. Put the iPhoto.app in the trash (Drag it from your Applications Folder to the trash)
2. Download it from the App Store to reinstall It's on your Purchases List* there.
For older versions that have been installed from Disk you'll need these additional steps:
2a: On 10.5: Go to HD/Library/Receipts and remove any pkg file there with iPhoto in the name.
2b: On 10.6: Those receipts may be found as follows: In the Finder use the Go menu and select Go To Folder. In the resulting window type
/var/db/receipts/
2c: on 10.7 or later they're at
/private/var/db/receipts
A Finder Window will open at that location and you can remove the iPhoto pkg files.
3. Re-install.
If you purchased an iLife Disk, then iPhoto is on it.
If iPhoto was installed on your Mac when you go it then it’s on the System Restore disks that came with your Mac. Insert the first one and opt to ‘Install Bundled Applications Only.
*Sometimes iPhoto is not visible on the Purchases List. it may be hidden. See this article for details on how to unhide it.
http://support.apple.com/kb/HT4928
One question often asked: Will I lose my Photos if I reinstall?
iPhoto the application and the iPhoto Library are two different parts of the iPhoto programme. So, reinstalling the app should not affect the Library. BUT you should always have a back up before doing this kind of work. Always.

After upgrade, firefox will not launch says : you cannot open the application "Firefox" because it is not supported on this architecutre how can i get firefox to work again?

unable to launch firefox after I upgraded firefox

I see you are using a PPC Mac with OSX 10.5.8.
Either you can use the last release from Mozilla worked on PPC which is 3.6.*.
The current 3.6.22 is at http://www.mozilla.org/en-US/firefox/all-older.html
Or use a third-party build from http://tenfourfox.blogspot.com/2011/08/601-now-available.html
As of Firefox 4.0 and newer a '''Intel''' Mac and OSX 10.5+ is required.

My iMovie no longer will load. Message says, "You can't open the application "iMovie" because it is not supported on this architecture."

I have been using iMovie successfully and have several movies saved, but now iMovie will not load. I have OS 10.5.8 and I don't know what to do. Are there any suggestions? I'm not even familiar with the term "architecture" or why it would be different than it was.

iLife '06 is the newest version that includes iMovie that a G4 will run. Any newer version of iMovie as included with iLife, will not run on a G4.

You cannot open the application "Xcode" because it is not supported on this architecture.

I'm currently trying to understand why XCode 4.3.3 gives me this message when download has completed. I have a MacBook Pro 10.5.8 OS X. Any help would be appreciated WWnewbee

As noted, your OS is not compatible, sorry - see Xcode Versions ~ iOS - As of 9.19.12.

Just downloaded mavericks, now iPhoto won't load because of an error message that says "You can't open the application "IPhoto" because it is not supported on this type of Mac" . I have a 17" MacBook Pro, mid 2010 model running 2.53 GHz and Intel Core I5,

I just downloaded the new Mavericks operating sytem on my mid 2010 MacBook Pro, 17" 2.53GHz, Intel Core I5 machine. My IPhoto is no longer working at all, I'm getting an error message that says - "You Can't open the application "IPhoto" because it is not supported on this type of Mac". I also loaded Mavericks onto my other MacBook Pro 17", mid 2009 model and everything works fine. I would think that the newer Mac would easily work with IPhoto. Also, when I try to download from the App Store, it asks for my Apple ID and Password, I enter it, and then the little spinning color wheel just spins forever, with nothing ever happening. I tried downloading the IPhoto Upgrade but it never actually downloads, HELP!!!

What version of iPhoto do you have installed? Is if one of the versions shown as not compatible in this screenshot?
If it is then go to the App Store and download iPhoto 9.5. It will be free if you have an iPhoto 9 or later verson currently.
OT

FF4 will not open after download... "you can't open the application "firfox" because it is not supported on this application." If 4 doesn't work on OS 10.5.8, then how do I get the old firfox back?

I downloaded the FF4 update and it has the "no smoking" symbol over the FF icon. When you attempt to open the app it states: "you can't open the application "firfox" because it is not supported on this application."
I have OS 10.5.8
If it will not work, how do I get the old version of FF back?

Are you sure you downloaded the .dmg file? It should have automounted for you and opened in finder. Then all you have to do is drag the FF4 icon over the Applications link in that finder window and it will install.
I seem to recall seeing the error you noted when I accidentally clicked a windows .exe file on my Mac.
Also, if you visit firefox.com from your Mac, it should be prompting you to download the .dmg anyway. The only way you could get the .exe would be to click the "other operating systems" link below the main download button.

I am trying to open up my iTunes from my Mac. It says "You can't open the application iTunes because it is not supported on this type of Mac." What do I do?

I am trying to open up my iTunes from my iMac. It says "You can't open the application iTunes because it is not supported on this type of Mac." What do I do? I've already force closed all other apps.

Well, obviously the problem isn't with the other apps, it's with the type of Mac you have. What type of Mac do you have?

Went to upgrade and says OS too old. I went back to older version of foxfire. Now I have a circle with a line through it and when I try to open it I get,You cannot open the application "Firefox" because it is not supported on this architecture.

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