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)
Use Diskmaker X to create a bootable Yosemite installer on an external disk or USB thumb drive
Or you can this from the command line:
For Yosemite you can create a bootable installer from a Terminal Session
<https://discussions.apple.com/thread/7080512?answerId=28389561022#28389561022>
<https://support.apple.com/en-us/HT201372>
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction
Then boot the external installer disk and install Yosemite
Install Yosemite on an external drive while running El Capitan?
