This one confuses me. I did run the beta's and GM of Sierra, and had done an update with the release version from the app store. Yesterday, I got a message that updates were available. When I looked to see what it was, it was the new 10.12.1 beta. Last night, it installed itself. My issue is that I do not have the option to install beta's turned on, as shown in the photo. In fact, there is no option for running beta's... I seem to remember on 10.11 that there was a checkbox for installing beta releases. How do I un-enroll from the beta updates? Thanks!!