Does Sys Prefs > Software Upgrade > "Automatically keep my Mac up to date" automatically install Catalina on a Mac running Mojave? Given a Mac running macOS Mojave, does turning on the checkbox "Automatically keep my Mac up to date" in System Preferences > Software Update mean that Catalina will automatically be installed? 

I want only minor updates and security patches to be installed automatically, not the major OS upgrades. I do not yet want to step up to Catalina.



I found this useless Apple support page about the Advanced panel that simply repeats the text of the checkboxes’ labels as a pseudo-explanation. (Tip: Click the Helpful? > No button at bottom of that page as feedback to Apple.)
No it does not.

I have Mojave and it installed several updates yesterday automatically but a major system upgrade has to be authorized manually. So it is telling me it is there and available but not installing until I give permission.

Edit: I have the updates checked in the advanced panel and it did not install Catalina. See:



I suggest it is a question of understanding: "install system updates" is relevant to the current system not changing to a new system