Can I use a copy of OS X Yosemite installer to install Yosemite on a Mac owned by someone else who obviously has a different Apple ID?
MacOS – Can I install Yosemite on a different Mac with another Apple ID
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Best Answer
Yosemite should be a free upgrade.
You can also download it for free here.
https://www.macupdate.com/app/mac/48498/os-x-yosemite