Through the beta testing process, developers and testers played a critical role in helping Apple:
You cannot mention a macOS Beta without mentioning its twin: . If macOS Sierra Beta 5 was the engine, the Xcode Beta DMG was the dashboard. Macos Sierra 10 12 6 Beta 5 Dmg Xcode Beta Dmg
If you only have a InstallESD.dmg inside the DMG (older style): Through the beta testing process, developers and testers