Today Apple released the GM Candidate 'Golden Master' of macOS Sierra to Beta testers. This means that the OS is very near final release, and this could be the last pre-release version. The official release date is September 20th.
If you've already installed the beta, the updated Installation App is available via the Mac App Store.
Enroll in...
Apple Releases macOS Sierra 'Golden Master' GM Candidate to Beta Testers
If you've already installed the beta, the updated Installation App is available via the Mac App Store.
Enroll in...
Apple Releases macOS Sierra 'Golden Master' GM Candidate to Beta Testers