The official way to download GarageBand for macOS Catalina 10.15.7 is through the Mac App Store's purchase history, provided the app was previously linked to your Apple ID. The current version of GarageBand in the App Store requires macOS 11 Big Sur or later, making it unavailable via direct search for Catalina users. How to Download on Catalina (10.15.7)
Verdict: For 99% of Catalina users, GarageBand wins by a landslide—especially because it’s free and fully integrated with macOS Core Audio. Garageband For Catalina 10.15.7 -FREE- Download
Be wary of sites claiming to offer "Free GarageBand Downloads" for Mac. Official versions are only distributed through the Apple App Store Why Choose GarageBand for Catalina? The official way to download GarageBand for macOS
What is GarageBand?
If you download an older version and get this error, try the following terminal command (found in Applications > Utilities):
Open Terminal and type: xattr -cr /Applications/GarageBand.app
(Note: Only do this for apps you trust from the App Store.) Ensure macOS is fully updated to 10
However, the latest versions often require newer operating systems like Big Sur, Monterey, or Ventura.