VPN - Can't run and unable to uninstall, can't find SelfProtect.ktext in /Library/Extension

I don't know why but a few days ago VPN decided to not run. After I try to launch I retrive a strange error with Finder icon: "File not found".
I try to uninstall following these steps suggested by the uninstall app:
https://www.bitdefender.it/consumer/support/answer/28441/

- run Mac in recovery mode → delete the folder "Bitdefender" inside /Library → and try to delete some *.ktext files indicated by procedure. But in my system I do not have any of these files: FileProtect.kext , SelfProtect.kext TMProtection.kext

Now I'm in a situation with can't run, can't re-install and can't unistall, but I am still paying for it… Any suggestion?