thanks!

Yes, thank you kind friend.

Has anyone figured out a way to prevent the upgrader app even when the user changes the app name (even just one character change is enough for the app to go through it seems).

I know that there is a unique process that the upgrade app uses, but that is common too all upgrades which would mean that even valid upgrades to Mojave would also get blocked...

We block the

InstallAssistant

that's worked for all macOS installers in the past.