GarageBand 10.3.5 was a minor update released by Apple in late 2020, primarily focused on stability improvements and bug fixes for macOS users. Key Details for GarageBand 10.3.5

Release Purpose: This version followed the significant 10.3 update (which introduced features like the Drummer and refined Smart Controls) and was designed to resolve performance issues on modern macOS versions at that time.

System Requirements: To run versions in the 10.3.x series, users typically needed macOS 10.13.6 (High Sierra) or later. Current versions of GarageBand now require significantly newer hardware, often requiring macOS 14.4 or later.

Distribution: While you are looking for a .dmg (Disk Image) file, Apple officially distributes GarageBand exclusively through the Mac App Store. How to Obtain Older Versions

If you are looking for this specific version because your Mac cannot support the latest release:

Mac App Store Purchased History: Open the App Store on your Mac and click on your profile/account name. If you have "purchased" (downloaded) GarageBand in the past, you can click the download icon next to it. macOS will often offer to download the "last compatible version" for your specific operating system.

Avoid Third-Party DMGs: Be cautious of third-party websites offering GarageBand 10.3.5 .dmg files, as these are not official Apple distribution methods and may contain malware.

Can You Download an Older Version of GarageBand? (2024 Update)

Most modern Mac users download GarageBand directly from the Mac App Store. However, the search volume for GarageBand 10.3.5 DMG persists for three critical reasons:

Before hunting for the file, ensure your hardware and software are compatible. Installing this on an unsupported Mac will result in a "corrupt installer" error.