Apple lets macOS users with a qualifying machine who wanted to opt into a public beta do so with a very few clicks. Visit the Apple Beta Software Program enrollment page, download an installer, and follow the instructions.
El Capitan’s public betas were very stable, even in early releases, and Apple’s incremental approach coupled with extensive testing truly seemed to help produce a mature “dot oh”: OS X 10.11.0 worked well out of the gate. But what if you don’t want to preview all the micro-releases, like the curent 10.11.1? As long as you’re in the program, you’ll get daily reminders about these new betas.
But you can opt out in a remarkably easy fashion.
Open System Preferences and click App Store. If you’re like me, you may not remember or have even ever visited this preference pane.
For Macs that opted into the beta program, there’s an option labeled Your Computer Is Set to Receive Pre-Release Software Update Seeds. Click Change.
Click Do Not Show Pre-Release Updates.
The pre-release option disappears and you’re no longer shown these updates in the App Store nor notified. You can opt back in through the page linked above if you want to resume testing early releases.
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