some uninstalling
step 4: reboot to normal mode
step 5: let the installer do its job
step 6: check the next day if the update works by clicking "update now"...
...It appears to me that I will have to uninstall and reinstall it a 3rd time if I want to play with creating a new account (instead of using the UN and PW created the 1st time that I downloaded) but my UN...
...files, download and run the Bitdefender product uninstaller from this link: https://www.bitdefender.com/consumer/support/answer/2791/
3) Restart your PC in safe mode....
You've pretty much thrown kitchen sink at it as far as a complete uninstall, if still needed, I would suggest your sending support the log files (as requested by them) and as @Alexandru_BD posted.