Open MainStage from your Applications folder. On first launch, the app will prompt you to download the essential sound library components.
MainStage 3.6.4 is a minor stability update for Apple’s live performance music software. The MainStage-3.6.4.dmg
MainStage does not install all its massive library (approx 30GB+) at once to save space. Open MainStage from your Applications folder
The 3.6.4 update, released in mid-2023, specifically focuses on tightening the stability and performance of the previous 3.6 iterations, offering essential bug fixes for users operating on modern macOS systems. What is MainStage-3.6.4.dmg? released in mid-2023
Official Apple Website or trusted software repositories.
Improved clock synchronization when sending MIDI clock data out to external hardware synthesizers and drum machines. System Requirements for MainStage 3.6.4