In order to install a working version of GarageBand, you will need two things: WARNING, PROCEED AT YOUR OWN RISK, AND MAKE SURE YOU HAVE A BACKUP OF YOUR SYSTEM AND DATA After jumping through some hoops, I am happy to report everything works as it did before I made the mistake of upgrading my MacOS to High Sierra. The earliest version you can still download and install from Apple is Yosemite. There is a solution however, but you have to be willing to revert back to a previous version of MacOS. After fussing with Apple support for two days, the simple answer is 'It doesn't work'! I tried installing GarageBand from the App Store, but it just kept crashing. I made the mistake of doing a clean install of MacOS 10.13.6, which is High Sierra. I've seen a lot of posts with people having similar issues installing GarageBand on their older Macs.
