Because I tried with the BD Uninstall Tool from the webpage but to AV Free doesn't exists one. (I don't know if the tool for AV 2020 Premium/Trial works anyway with the free version)....
It seems that the uninstall tool will be operated under the safe mode of Windows and you will be asked to confirm the uninstallation of Bitdefender....
and yes I uninstalled both antivirus/antimalware programs, ran the cleaners from the BD site and ccleaner afterwards I purchased BD directly from the BD site thanks mike...
...The customer service agent asked me to uninstall and reinstall Bitdefender, but that didn't help either. I've still got Version 8.3.0.30. Any suggestions?