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Re:Apple Begins High Sierra Automatic Rollout by GeekyBear on Saturday November 18, 2017 @11:23AM (#15729577)
If you do not want your Mac to automatically download updates:

uncheck "Download newly available updates in the background" in the App Store section of your computer's Control Panel.

https://support.apple.com/en-us/HT207251

Re:Apple Begins High Sierra Automatic Rollout by gammarator on Saturday November 18, 2017 @12:41PM (#15729899)
I found this too late--I was traveling overseas and purchased metered internet--woke up to find 5/12 GB gone...
Re:Apple Begins High Sierra Automatic Rollout by ricpass on Saturday November 18, 2017 @06:17PM (#15731231)
I already had that setting disable and High Sierra Installer was downloaded automatically anyway.

The only option enable for me is "system data file and security updates".

BTW, if someone doesn't want to use terminal. It's possible to control all App Store downloads/install behavior on "System Preferences" > "App Store".