: In newer legacy versions like 10.1.x, you can go to GarageBand > Sound Library > Download All Available Sounds to update your loops and instruments. Important Compatibility Notes Install Old Version of Garageband - Apple Support Community
: Begin by opening the Mac App Store on your Mac. If you're running Mac OS X El Capitan 10.11.6, you might need to ensure your system is connected to the internet and that you have the latest version of the operating system installed. garageband mac os x el capitan 10116 download extra updated