Once GarageBand is installed on El Capitan, downloading "extra" updated content (loops, instruments, and drummers) can be problematic because Apple's older update servers are sometimes offline.
This clever “cross‑purchase” method effectively ties the software to your account, making it available for your older machine. garageband mac os x el capitan 10116 download extra updated
Log into the Mac App Store on a newer Mac (running Big Sur or later) with your Apple ID. Download . Once GarageBand is installed on El Capitan, downloading
Double-click the downloaded packages to run the installer, which places the instruments automatically into /Library/Application Support/GarageBand/ . Alternative Solutions: DMG Archives downloading "extra" updated content (loops