I'm myself not very good at RTMP parameters. RTMP is very different from what was used in other streaming protocols. I mostly use GUI programs that don't require to learn more about it.

Try to use NetTransport.

Or try to download the stream found with Grab++ using Orbit Downloader. May be it will show the URL that you need.

The easiest way seems to be to use rtmpsuck. But I don't really know how to make it work on Windows. If you install Linux, you shouldn't have any problems with it.