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?