Avast will not start and GUI will not load

I am using Windows defender at the moment. As Avast wont start.

After updating to version 18.4.2338 build 18.4.3895, Rebooted twice.
Now I have GUI failed to load and avast will not start.

All was working perfectly before update.

Do not know what the Avast devs are doing,as I have seen people complaining about GUI not loading before this update. They must have decided to share the GUI problem to other users.

Edit Also Avast VPN dosn’t work now as well
I have now uninstalled Avast as I couldn’t check or know if Avast firewall was working. I had Avast Internet Security installed