Just installed 5.0 3 days ago after using previous version. Today it would not start, and found out it was not going to start because it was not registered. Info said had to be registered within 30 days…mine refused to work after 3. Registered it, but have to wait up to 24 hours to get email with key. So, have to download a different product to use.
You shouldn’t have had to use the registration to get an email and input the registration key. The preferred/easiest option for those whose computer is connected to the internet it to register directly through the avastUI, Maintenance, Registration, Register Now button, see image.
You shouldn’t have to wait 24 hours to get your email (though it does say that just in case), it is usually sent almost instantly, but you can find emails although send at the time of registration don’t arrive immediately. however, it should have given you the 30 days and why is a bit of a mystery and al I can think to check is your system date to ensure that is correct.