If you are still running macOS Mojave or High Sierra and use GarageBand 6.0.5 extensively, be aware that upgrading to Catalina will break that older software. Therefore, it is wise to hold off on updating if you rely on legacy projects or 32-bit plugins.

If you’re running and need the last compatible version of GarageBand, you’ll want GarageBand 10.15.7 . This version was specifically optimized for Catalina and offers full functionality without requiring a newer macOS.

I can help guide you through the process of restoring the correct version. Share public link

You can start a song on an iPhone or iPad and import it wirelessly to your Mac to continue production. How to Download on Catalina

This is a quick method for those who maintain regular Time Machine backups .

If you are running a vintage but highly stable setup on macOS Catalina 10.15.7, you cannot simply click "Download" on the main GarageBand storefront page. However, you can still get a fully functional, official copy of GarageBand compatibility-matched to your system. Why the Standard App Store Download Fails

The current GarageBand requires at least macOS 11.0 (Big Sur) or higher.

For advanced users who are comfortable troubleshooting potential issues, a community-trusted version (GarageBand 10.2.0) is available for download.

: Click Download to install the version compatible with 10.15.7. What to do if you've never downloaded it before

Now, go back to your Catalina 10.15.7 Mac.