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I've got several computers that I manage. Last week just before the release of El Capitan I upgraded one of them to Yosemite; I now want to upgrade the rest to Yosemite (the reason I'm not going straight to El Capitan is that a core piece of daily software I use doesn't work with it yet).

The other machines I want to upgrade are all currently running 10.8.x (not sure what version but it's the latest).

Is it possible to still download a copy of Yosemite to install?

I've also got a copy of Yosemite saved to a USB stick that I used for the clean install of one of the computers. Could I just use this to clean install Yosemite onto the other computers? The first computer I used this on was an MBP late 2012 going from 10.9 to 10.10 while the other computers are a mixture of Mac Minis and MBPs going from 10.8 to 10.10. Would they need a different version of Yosemite to install or is it all the same version?

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You should be able to download Yosemite from the App store if you login with an account that had previously acquired it.

If the USB stick was made with an App store copy of "Install OS X Yosemite.app", it will work on any hardware that existed prior to the release of the copy you downloaded.

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    Perhaps important to know, most Appstore downloaded files are linked to your Apple ID, but the OSX installers are not. Once you have a copy you can install it on any Mac you desire. (During and) after install OSX doesn't know through which Apple ID the package was downloaded. – EDP Feb 23 '16 at 8:46
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Just use the USB (unless you have very fast internet). If you do download them, you'll need to be logged into the same Apple ID on the Mac App Store. Then you can go to purchased and download the installer.

Edit: the USB will work on all machines compatible with 10.10. If you use it, you do not need to clean install it. Just running the installer will be the same as downloading & running it from the MAS.

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It's not possible to download OS X Yosemite installer app from App Store any more. The latest OS X which is available at the moment is El Capitan. If you had previously created Yosemite USB drive, just use it.

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