For users on legacy systems like OS X Yosemite or El Capitan, obtaining this version can be challenging as the current Mac App Store typically only offers the most recent version compatible with the latest macOS.
Older versions like 10.0.3 may not support modern high-end audio interfaces that require specific drivers. GarageBand 10.0.3 dmg
Upon the first launch, GarageBand will prompt you to download the "Essential Content." This is required to use any instruments or loops. For users on legacy systems like OS X