Avast have introduced a feature call cyber capture.
Well it captured SkyDemon during the installation of 3.6.4 and I get a popup that says "This file might be dangerous" and that it has been submitted to the Avast Virus Lab. There is a tab that can be clicked to say I trust the file but that still doesn't allow me to open SkyDemon. Until they apprve SkyDemon, I suspect this will happen to anyone donwloading the update becasue I can't see anyway around this in Avast.