First, restart your Mac in Safe Boot and after this, restart your Mac without pressing anything else and it will start in normal mode by default. Reinstall Bitdefender Antivirus for Mac from your Central account. Now, conduct a manual update by opening the main interface and then pressing the Command and U keys simultaneously on your keyboard.

<a href= "http://www.bitdefendersupportnumber.co.uk/">Bitdefender Support UK</a>