After being prompted to reboot my computer for update to take effect, my update no longer works.

Any solutions? I do not know what happened, I just restarted my computer like I was asked and this happened
I like using BitDefender and just want to know whats going on and if theres any solution to this ?
+ I've never been able to auto-update, I constantly get an Invalid MD5 error
Been trying for atleast a month... I just use the manual updates.