Simply search for "GarageBand" in the App Store. Apple typically only lists the latest version. If your Mac supports the current OS, you will get the most recent build (currently GarageBand for Mac version 10.4.11 or higher).
Whether you are downloading it for the first time or holding onto the installer file for dear life, GarageBand 10.4.1 stands as a testament to Apple’s philosophy: give away the razor (the software) to sell the blades (the hardware). In this case, the razor is sharp enough to cut professional tracks. Garageband 10.4.1 Download
(End of essay)
Added over 1,800 Apple Loops and 190 instrument patches. Simply search for "GarageBand" in the App Store
Here is comprehensive content regarding download, including official sources, system requirements, installation steps, and key features. including official sources