stevenfromsunnyvale

Q: Install Yosemite on an external drive while running El Capitan?

Is there a way I can install Yosemite on an external drive from a Mac running El Capitan so that I can have the option of running Yosemite? When I try to run the installer, I never get a chance to specify the target drive. I immediate get a message saying

 

This copy of " the "Install Mac OS X" application is too old to be opened on this version of OS X.

 

Is there any way I can go backwards?

Mac mini (Late 2012)

Posted on Feb 21, 2016 5:55 PM

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Q: Install Yosemite on an external drive while running El Capitan?

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