Before version 10.4, GarageBand ran on Intel chips. If you tried to use it on an M1 Mac (MacBook Air/Pro 2020), it would run via Rosetta 2 emulation. Version 10.4 made GarageBand native. The result?
The 10.4 update series introduced several visual and functional enhancements: Design Overhaul garageband 10.4 dmg
For many users, is the “goldilocks” version. It introduced the powerful Sampler (Auto Sampler), Drum Synth, and a revamped Sound Library—all without the complete UI overhaul of later versions. Before version 10
The App Store's versioning system handles legacy software better than any manual installer. If you need 10.4 for plugin compatibility or speed on an old Mac, simply wipe the machine and install the oldest version of macOS that machine supports—the App Store will give you the correct GarageBand automatically. The result