grandcrew.com doesn't use SWF verification. Replay Media Catcher can download RTMP videos from it without any problem. If you install freeware DarWine, RMC and Firefox for Windows, you shouldn't have any problems downloading the videos.

If you manage to find RTMP stream URLs, you can also try rtmpdump.

Currently TubeMaster++ doesn't work on a Mac. Besides it is not very good at capturing RTMP streams.

You can also ask the developer of xVST to support grandcrew.com. The program doesn't have a network sniffer, so one have to ask for every particular web-site that he/she wants to be supported.