Garageband 10.4.8 Link -

The Evolution of Music Creation: A Deep Dive into GarageBand 10.4.8

You are on a critical project deadline with macOS Monterey (10.4.8 is glitchy on older OSes).
You use unsupported 32-bit plugins (they will never work again).
You prefer the legacy "Magnetic Timeline" look (the UI is now fixed to the modern flat design).

8 stuck on loading screen (Updating information about audio unit plug-ins...) I have looked at other posts relating to this issue, Apple Support Community About the security content of GarageBand for macOS 10.4.8 garageband 10.4.8

Free to download and use
User-friendly interface
Robust feature set
Compatible with a wide range of file formats

Steps: