Moviefap uses simple HTTP streams. It it very easy to download/save/capture/record HTTP .flv videos:
FAQ: How to record/download/capture/save Adobe Flash .FLV video HTTP stream from embedded player

I tried Replay Media Catcher 3.11 and it works fine for me. Please note that HTTP videos are cached, so you may need to clear the browser cache to download the video. You can also use the Video History Tool of Replay Media Catcher to save videos from browser cache to your hd.

You may also save HTTP streams using freeware Jaksta Free Media Recorder, Freecorder and download them using freeware Fast Video Download.

You may also want to download an FLV player, although Replay Media Catcher comes with freeware Applian FLV Player that should work fine.