Open the App Store on that newer Mac and of the current user's Apple ID.
Before diving into the download process, it is crucial to understand the technical barrier. Apple continuously updates GarageBand (currently version 10.4.x) to utilize modern Metal graphics APIs and system frameworks introduced in macOS Mojave (10.14) and later.
A prompt should appear stating that the current version is incompatible, but offering to "Download the last compatible version" for your OS. Apple Support Community Workaround for New Users Garageband Mac Os X El Capitan 10.11.6 Download
Run the Installer.pkg file and select only GarageBand if you want to save disk space.
(or click your account name at the bottom left). Open the App Store on that newer Mac
Replacing an old mechanical hard drive with a Solid State Drive dramatically improves audio track buffering and file loading speeds.
To set realistic expectations, here is what you are missing by sticking with El Capitan vs. upgrading your hardware/OS: A prompt should appear stating that the current
Obtain an or a trusted ISO disk image of the retail retail disc.
Scroll through your list of purchased apps to find . Click the Install button next to it.
You are looking for . This is the final version that supports El Capitan. Once installed, avoid updating your OS if you rely on GarageBand heavily, as newer macOS versions introduce changes that may not support your specific hardware.