Today I encountered a nagging screen from AutoCAD 2018 telling me that my AutoCAD license is invalid. It appears every few minutes. You can close it and continue using the software freely but the nagging dialog is getting annoying.

I downloaded it from rutracker years ago. No nagging screen appeared until today.

Does anyone know how I can fix this? I already added a rule in the Firewall settings to block connections.

Apologies if my wordings are bad, English is not my native language. Also, I’m not savvy about these stuff so please bear with me, thank you.

EDIT: added the version of AutoCAD to the title and body.