Apple Garage Band - How to install additional Sound Library

On the computer, you want to install the Loops –

Right click on desktop and choose show view options

Choose Calculate all sizes
Choose Use as Defaults

In Finder -> Go to Folder /var/folders/

Sort by largest file size

Open the folder that has the largest file size in this example "rv"

Open the folder

Double-click random string folder to open

Sort by largest file size and open folder (usually the 'C' folder)

Copy the 'com.apple.com.garageband10' folder (approx 21GB) into that "C" folder

Launch GarageBand app

Go to GarageBand>Sound Library>Select Download All Available Sounds