Garageband For Catalina 10.15.7 -free- Download __link__ -
Apple generally only offers the most recent version of its apps on the main App Store page. If your Mac is stuck on Catalina, the "Get" button will likely return an error saying your OS is too old.
If you’re staring at a "This app requires macOS 11 or later" error while trying to get GarageBand on your Catalina machine, don't worry—you don't have to buy a new Mac just to lay down some tracks. Garageband For Catalina 10.15.7 -FREE- Download
Conclusion
Getting GarageBand on macOS Catalina 10.15.7 is entirely possible and free, though the process is slightly different than a standard download. Because the latest version of GarageBand in the Mac App Store typically requires macOS 11 Big Sur or later, users on Catalina must access the last compatible version (typically version 10.3.5). How to Get GarageBand for Catalina 10.15.7 Apple generally only offers the most recent version
Troubleshooting (What if I see "Requires macOS 11.0 or later"?)
If the App Store refuses to let you download because it says a newer macOS is required, use your Apple ID purchase history: Conclusion Getting GarageBand on macOS Catalina 10
Important Requirement: macOS Catalina 10.15.7 is the minimum required OS for this method to work.