The safest and most reliable approach is to use official Apple channels. Here are the legitimate methods that work for El Capitan users.
If you manage to find an older installer package but it refuses to run, your Mac's system clock might be conflicting with an expired security certificate inside the package. garageband mac os x el capitan 10116 download link
It is highly recommended to for the following reasons: The safest and most reliable approach is to
Finding a direct, official download link for a compatible version of GarageBand on OS X 10.11.6 El Capitan can be challenging because Apple only hosts the latest version on the Mac App Store. However, it is entirely possible to install a functional, older version (typically GarageBand 10.1.x or 10.3.x) by leveraging your Apple ID purchase history or using specific workarounds. The Challenge with El Capitan It is highly recommended to for the following