Just FYI, you can disable that notification: https://www.macworld.com/article/3447396/how-to-stop-getting-a-reminder-to-update-to-catalina-in-macos.html https:

Just FYI, you can disable that notification: https://www.macworld.com/article/3447396/how-to-stop-getting-a-reminder-to-update-to-catalina-in-macos.html https://www.macworld.com/article/3447396/how-to-stop-getting... It does not prevent the red notification dot on the System Preferences app, but it does mean at least you don't get the notifications pop up on your screen.