Or just use
RTMPdump to download the replay.
Code:
rtmpdump -r "rtmp://s1jsst53e5pbdk.cloudfront.net/cfx/st" -a "cfx/st" -f "WIN 10,3,183,5" -W "http://s3.amazonaws.com/newwebinar/flowplayer.commercial-3.2.7-nobrand.swf" -p "http://livewebinarsolutions.com/event/1003855" -y "mp4:dent/DentWebinare081511MP4" -o DentWebinare081511MP4.flv