Apple Developer Program. Public beta testers will have to see it doping up on their units later nowadays or the next day. When it releases later this summer time, macOS Sierra 10.12.6 might be a most commonly bug-fix update with safety and function enhancements.
To update, registered developers merely want to open the Mac App Retailer, test the Updates tab, after which set up the device from there. It's also to be had by the use of the devoted developer portal on Apple’s site.