I have Posted this on my Thread but thought it warranted a fresh topic.
FIXED, for ME at least as nothing seemed to clear it…even a full remove with the tool and uninstall/re-install.
The difference I think was using the offline installer?
Finally had a response from AVAST direct via Facebook Messenger.
Now, I already tried a reinstall and Avast clean but failed.
Avast said do it again but use the OFFLINE installer.
I totally removed AVAST - used the Avast Clean Tool and downloaded the offline Avast Free Installer.
I also ran CCleaner (and registry fix) too!
Reinstalled Avast using that offline installer, logged back into my account and Voila! no more nag!
Please let me know if it works for you!