hello Tech
Have no avast.setup file in my firewall, only the 3 I named, and they are allowed to connect.
After uninstalling, downloading and reinstalling an other instance, I entered a new registration number, for an other name. It seems to be working fine, no more red popup and I can update from anywhere in avast!
My firewall is McAfee.
Maybe misunderstood you about the avast.setup; where is it?