I downloaded and installed the macOS 10.12, Sierra public beta yesterday. I put it on my late 2013 15” MacBook Pro. I’m one of those lucky people with multiple (3) Macs, so I never run the risk of upgrading myself out of production. To be fair, I’ve had pretty good luck installing OS X betas. Even before Apple’s public beta program, my developer status afforded me access to early copies of everything Apple published. I hardly ever install a “Rev 0” version of anything, but Apple has a decent track record of releasing mostly stable versions of their OS by the time it gets to “public” status. I didn’t have that experience yesterday.
So, why would a semi-intelligent person like myself risk the utility of a multi-thousand dollar laptop by installing a half-baked operating system? Well, there was one feature of macOS Sierra I couldn’t wait to try. I wanted my Watch to unlock my MBP by simply coming in proximity. I never got there. More on that in a minute.
First, the install went without a hitch. I went to Apple’s developer site, clicked the “Download” button for macOS Sierra Beta 2. That launched the Mac App Store app where I redeemed a code that started the download. 4.86 GB later, the install screen appeared.