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A nagging screen from AutoCAD 2018 suddenly appeared after using it for 3 years.
Funnily enough we got this message even in enterprise environment, where licenses were paid (and damn they are expensive). I’m convinced it’s just some process in the software itself. Have you tried looking through every process? Gotta find that one file that starts this pop-up and block it. I think that’s why your firewall rule didn’t help.