If GarageBand isn't in your "Purchased" list, the App Store will likely block you. The standard workaround is to "purchase" (for free) GarageBand on a newer Mac
Do you have in your App Store purchases history?
"The current version requires macOS 11 or later, but you can download the last compatible version." Apple Support Community Method 2: Use a Newer Mac (Never Owned)
to bypass the "verified developer" block if the app refuses to open after installation? garageband mac os x el capitan 10116 download extra verified
A prompt will appear stating the current version is incompatible but will offer to download the for your OS.
The full GarageBand experience includes downloading additional sound libraries, loops, and instruments. On El Capitan, you may need to download these through the application's Sound Library menu after installation. In some cases, you may encounter issues downloading the sound library, which can sometimes be resolved by reinstalling the application.
A prompt will appear stating: "The current version requires OS X 10.15 or later, but you can download the last compatible version." Click Download to confirm. If GarageBand isn't in your "Purchased" list, the
A user has uploaded a version titled "Garage Band 10.2.0-2017" which has been verified to work on Mac OS 10.11.6 or later. The uploader noted they obtained it from an official El Capitan install from the App Store. If the other methods fail, this is a trustworthy, community-verified resource.
Since Apple has officially sunsetted support for El Capitan, downloading GarageBand on this OS is no longer a simple "one-click" process from the main App Store page. It requires a specific procedure involving the "Purchases" tab and compatibility checks.
If these methods prove too difficult, you might consider these alternatives: A prompt will appear stating the current version
If you have, follow these steps:
To verify the download for your El Capitan machine, you need access to a second Mac running macOS High Sierra or newer (or borrow a friend's Mac briefly).