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Pretty sure that’s not the UI for major version updates.

False. That is exactly the interface on my computer, which leads directly to the upgrade to Catalina interface.

I can ignore that, and install only security updates instead, but that is indeed the UI for the update to Catalina.

If you install the security updates, so only the Catalina install is pending, do you still get this UI?

I'm under the impression that you don't. I did install the security updates, and I think this thing went away, but I'm not 100% sure.

Yes, you still get this UI.