[any ANONYMOUS forum user]

How can I download video streams from abc.go.com with freeware rtmpdump (http://all-streaming-media.com/record-video-stream/rtmpdump-freeware-console-RTMP-downloading-application.htm)?
http://abc.go.com/watch/castle/186439/240749/kill-the-messenger?cid=fullepisodeaccess

I'm not a computer geek, so please use layman terms.
Thank you!