macOS Catalina (version 10.15.7) remains a popular operating system for users with older Mac hardware. However, finding and downloading a compatible version of GarageBand for this specific OS can be frustrating. The Apple App Store automatically pushes the newest version of GarageBand, which requires macOS Big Sur (11.0) or later.
If you are setting up a older Mac or have recently downgraded to macOS Catalina, you can restore a compatible version of GarageBand from an existing backup. garageband catalina 10.15 7 download