Apple posts fourth beta of macOS 10.12.6 dsellers 7 years ago Apple has released a fourth developer beta of macOS 10.12.6. It can be be downloaded from the Apple Developer Center. Share this: Apple Releases Third Developer Beta Of macOS 10.12.6June 13, 2017MacTech NewsApple posts new iOS 10.3.3 and macOS 10.12.6 betasJuly 5, 2017MacTech NewsApple posts new iOS 10.3.3, macOS 10.12.6 developer betasJune 28, 2017MacTech News