DavidR
4
OK, next check out this:
At the top of my last image, ensure that your settings reflect your connection method, ‘My computer is permanently connected to the internet.’ I think that they are both blank by default, but it should check both methods of connection to see if the connection is present.
Presumably you do have a wireless connection at the time avast checks for updates (very soon after boot) ?
It should be present before it checks for updates. It might be that although the connection is present it isn’t fully established. Do you get the same error if you try a manual update ?