Vlk
3
Silent installation is available only in the Pro Edition indeed. It’s documented in the Help file, and is technically accessible via the Enhanced User Interface.
About the legalities of preinstalling avast on customer’s machines, please refer to this thread: http://forum.avast.com/index.php?board=2;action=display;threadid=5959 which quite comprehensively covers this topic.
Thanks
Vlk