If GarageBand is not in your purchase history, you can "link" it to your Apple ID using a friend's newer Mac.
: "Purchase" or download the latest version of GarageBand (it’s free). Step 3 : Sign out of that Mac. garageband mac os x el capitan 10116 download extra updated
: This version is highly stable on El Capitan. If GarageBand is not in your purchase history,