Here are the instructions on how to update Bitdefender:
Download the .vsaz file from here:

https://www.bitdefender.com/business/support/en/77211-122400-integration-and-syncronization.html

Then go to your VSA – System-License Manager- click on Third Party on top and select Bitdefender and install the file you just downloaded over the existing plugin.
DO NOT UNINSTALL and reinstall it as it can cause issues with the integration. 

Please make sure that the Bitdefender.vsaz file looks exactly like this – it cannot be a copy Bitdefender(1).vsaz or Bitdefender(2).vsaz, for example. 

Give it a few minutes to take effect and you should be all set.