I have Windows 10 and just purchased a ScreenBeam mini 2. The Avast firewall is blocking ScreenBeam from projecting my laptop screen onto my tv. When I disable the Avast firewall, it connects although I had no sound. I tried to add as an exception but because it is an app in Windows 10, I can’t get to the program files to approve the app. Not sure what to do at this point.
You could try the latest beta: https://forum.avast.com/index.php?board=15
One simple question. Is your Avast Firewall set to Private (instead of the more restrictive Public setting)?
The firewall is set to Private.