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A popup about "iCloud Drive not enabled." Fix: El Capitan’s iCloud Drive is primitive. Go to System Preferences → iCloud → iCloud Drive Options and uncheck "GarageBand." Save projects locally.
Once installed, you want the app to run smoothly. El Capitan is over a decade old, and modern projects can strain even a 2015-era Mac. Garageband Mac Os X El Capitan 10.11.6 Download
The bad news? The modern version of GarageBand from the App Store requires macOS 13 or newer. The good news? A popup about "iCloud Drive not enabled