Use this start URL: 
<http://video.techsmith.com/camtasia/5/edu/quickstart/enu/default.html>

and this filter: 
 -* +http://video.techsmith.com/camtasia/5/edu/*  +*.swf

If you want only the Flash video, then consider using build structure -N4 to
sort different file types corresponding folders: e.g. all .swf files in
/web/swf/, all .png files in /web/png/ and so on...

 -Bo