While Apple focuses on the latest operating systems, you can still absolutely use by leveraging the "Purchased" section of the App Store to download a compatible version. If you'd like, I can: Tell you which third-party plugins work best on Catalina
Borrow a newer Mac running macOS Big Sur, Monterey, Ventura, or Sonoma.
Note: Avoid downloading from untorrented software blogs or unknown third-party sites, as these files can contain malware. GarageBand System Requirements for Catalina Requirement macOS Catalina 10.15.7 GarageBand Version Version 10.3.5 Available Storage Minimum 2GB (20GB+ for full sound library) RAM 4GB minimum (8GB recommended) Troubleshooting Common Issues Garageband Catalina 10.15.7 Download
Do you have access to a to assist with the download?
Catalina was the first macOS to drop support for 32-bit apps entirely. While GarageBand itself is 64-bit, older plugin bridges work better on Catalina than on newer macOS versions. If you rely on older legacy plugins, Catalina is often the last "safe" harbor before moving to Big Sur or Monterey. While Apple focuses on the latest operating systems,
This directly affects GarageBand because:
A prompt will appear stating: "The current version requires macOS 11 or later, but you can download the last compatible version." If you rely on older legacy plugins, Catalina
Catalina supports the latest "Logic-like" redesign of GarageBand. You aren't missing out on features that users on macOS Sonoma have. You get the modern interface, the expanded Sound Library, and the intuitive design that makes it easy to transition to Logic Pro X later.
A prompt will appear: "Do you want to download the last compatible version?"