![]() Go to the App Store, log in, and click on the install button of your previously purchased copy of GarageBand. Now select the “Install Mac OS app from the list, and proceed to installing a copy of Yosemite. Quit the Disk Utility app, which will return you to the restore application menu. It will reformat as MacOS Extended Journaled. Launch the Disk Utility app, select your internal hard drive, and erase it. WARNING, THIS NEXT STEP IS IRREVERSIBLE!!! MAKE SURE YOU HAVE YOUR SYSTEM AND DATA BACKED UP, AND YOU HAVE AN ALTERNATE METHOD TO INSTALL THE LAST VERSION OF MAC OS YOU ARE CURRENTLY RUNNING. Before you can install your new Yosemite OS, you will need to erase your existing hard drive. The installer will launch a minimal OS containing a restore application menu. Select your “Install OS X Yosemite” USB drive. When the OS comes up, it will prompt you for which hard drive to boot from. This will put your Mac into Restore mode. ![]() Restart your Mac holding the “Option” key. Sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/USB -applicationpath /Applications/Install\ OS\ X\ Yosemite.app The command assumes that the installer is already in your Applications folder, and USB is the name of the USB flash drive you're using (as directed above. Type or paste the command below in Terminal. You will be using the 'createinstallmedia' command in Terminal. You can find the Terminal app inside the Applications folder, inside the Utilities folder. In order to create a bootable drive, you will need to use a Mac app called Terminal. Plug a 16GB (minimum size) USB thumb drive into your Mac. Now you are ready to create a bootable USB startup disk containing the Yosemite MacOS installer. It will install an app named “Install OS X Yosemite” in your Applications folder. It just installs the installation application so that you can run the installer. Your web browser will download the Yosemite installer as a disk image named InstallOS.dmg or InstallMacOSX.dmg. This next step does not actually install the MacOS. Scroll down to the Yosemite link and click on it. The App Store will automatically check what MacOS you are running, and download an older, compatible version.
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