MacOS Sierra is a free upgrade and works on any Mac dating back to 2010, and on MacBooks and iMacs from 2009. While Apple's betas tend to be reasonably solid by the time they are widely released, we still don't recommend installing them on mission-critical systems.Ģ. Of course, you use a beta OS at your own risk. (Registered developers and PCMag had access to a very early beta version before that, and we've been testing it ever since.) If you want early access to the next version of macOS (or the iPhone's iOS) you should sign up at (Opens in a new window). macOS Sierra is available as a free upgrade right now, but many people got early access to it by taking advantage of a public beta Apple made available a few months ago. But macOS Sierra is about a lot more than just the name. The underlying architecture and overall experience remain basically the same, but the name is now consistent with Apple's iOS and watchOS.
If you're upgrading to the latest version of Apple's operating system, you'll be upgrading to macOS, not OS X.
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