Did you try from this link?
http://through-the-interface.typepad.com/through_the_interface/2009/08/free-webcast-autocad-net---developing-a-user-interface.html
Click on "for download (20.3 MB)".
wrote in message news:6250683@discussion.autodesk.com...
Can anyone download the webcast? When I tried I was asked for a logon...