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
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".