Quoted from the http://tidbits.com/article/17633: "If you're running macOS 10.12 Sierra or earlier, and do not want to upgrade to 10.13 High Sierra right now, be careful because Apple has started pushing High Sierra to older Macs and making it all too easy to upgrade inadvertently." [...]
(Score: 0) by Anonymous Coward on Tuesday November 21 2017, @04:36PM (1 child)
[...] "You can "hide" updates in the App Store (Software Update) application, but I don't know for certain if that would keep the notification from appearing." [...]
Updates can only be hidden (when logged in) in the 'Purchased' section of the App Store. In the 'Updates' section (doesn't require login), updates cannot be hidden.
(Score: 2) by RedBear on Tuesday November 21 2017, @08:36PM
I don't believe that's correct. The latest OS X upgrade tends to appear as a big graphic "ad" in the Updates tab, and it can be hidden by right-clicking and choosing Hide from the context menu. After that it never appears in the Updates tab again. I forget whether it just says "Hide" or "Hide Update". Probably the latter.
In the Purchases tab the context menu item says "Hide Purchase". That's different from what I was talking about. Unless things have changed in Sierra/High Sierra.
In my experience the Updates tab does require login when you try to install 3rd-party application updates, at least if there are non-free apps you've purchased from the App Store.
¯\_ʕ◔.◔ʔ_/¯ LOL. I dunno. I'm just a bear.
... Peace out. Got bear stuff to do. 彡ʕ⌐■.■ʔ