I need to downgrade mac os x on one computer, from El Capitan to Yosemite.No Time Machine backups were done so i need to go with the os x bootable installer.

The problem is Yosemite does not appear anymore in the "purchased" tab in the app store application.

I could get a Yosemite installer from another Mac though, so the question is- will yosemite installer from another Mac do the work here? Or is it meant to be used only on that other Mac?

  • The installer will work on any machine - but with no backup, you will lose your existing data, there is no way to downgrade in-situ, only nuke & pave.– TetsujinNov 13 '15 at 13:10
  • Yes thats no problem for me. Data on that Mac is no longer important.– user520068Nov 13 '15 at 14:11
  • The Yosemite installer will work fine on another machine– enzoNov 13 '15 at 17:35

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.