Once the download is complete, GarageBand will be installed automatically. You can find GarageBand in your Applications folder or use Spotlight to search for it.
GarageBand is a free digital audio workstation (DAW) developed by Apple, which allows users to create, record, and edit music. If you're running macOS Catalina 10.15.7 and looking to download GarageBand, here's a step-by-step guide to help you get started: Garageband Catalina 10.15.7 Download