Apple today began seeding both developers and public beta testers with the fourth build of macOS Sierra 10.12.4 for trying out and debugging on the Mac. This comes a week after the third build surfaced and before an initial release of the software likely sometime next month.
So far, no new features or changes have been spotted in macOS 10.12.4 beta 4 except the usual bug fixes and speed improvements. In macOS 10.12.4, Apple is introducing Night Shift for the Mac in order for your eyes to not strain as easily while working in poorly-lit environments. If you notice something we may have not, forward your sightings to firstname.lastname@example.org and @MBEDDEDMaximum on Twitter.
To install the latest macOS Sierra 10.12.4 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 10.12.4 Beta 4 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.