I downloaded the free version (7.0.0) yesterday and it's not letting me register. Maintenance->Registration says, "Current registration will expire on: -" and "Date of registration: -" (see first image).
When I hit Register Now->Register & fill in my email, it says it worked, but the dialog has an X and Avast still thinks I'm not registered (see second image).
And so then I tried the offline registration, got my key over email, and copy-pasted it and it says it's not a valid license key! (Third image)
Help, I just want to register!