Request a new license key for personal use only (you have to buy one if you want to use Bitdefender in a commercial setting).
Locate the config file of bitdefender, for version 7.6 this is in cd /opt/BitDefender-scanner/etc
Update the license key at the end of the file sudo vim bdscan.conf
Update the scanner and definition files sudo bdscan –update
~~LINKBACK~~
~~DISCUSSION~~