Today we saw the rollout of iOS 10.2.1 beta 3 begin, and now it looks like Mac users are also in for a treat as Apple has also begun rolling out macOS Sierra 10.12.3 beta 3. This comes nearly a month after the second build of the future software upgrade for the Mac became available for testing, while this particular build likely includes simple bug and security fixes out of preparation for a public release sometime in the near future. For those who make discoveries about the latest macOS betas, you can forward your sightings to firstname.lastname@example.org and @MBEDDEDMaximum on Twitter.
To install the latest macOS Sierra 10.12.3 beta on your registered Mac, head over to the “Updates” tab in the App Store and check for updates. There, you’ll find the new build ready to install. Just click the “Update” button next to the macOS Sierra 10.12.3 Beta 3 listing and restart your Mac. The process may take a little while, so be patient and don’t turn off your Mac manually if you don’t have to.