I'm having the same problem--downloaded DGM and installed it, but when I run it, nothing shows up under "Games." I have "Show Betas" checked. I've reinstalled, plus I've sent the error file to Stardock, but they still haven't come up with a solution, and I purchased the game about two weeks ago. I'll have to see if I can figure out the registry thing, although I don't know exactly what I'm looking for and I'm a bit leary about messing with the registry.
On the other hand, it's clear that this is not a scam. I doubt that all of these posts are phonies intended to sucker me put of my money--not to mention the coverage of the game in the gaming press and the fact that Stardock is a real business with a number of other products. But, I really do want to play this! Reading these posts here has me all psyched up, and it's frustrating not to be able to play, but throwing accusations around doesn't seem like it will get me anywhere. I just hope that someone in tech support can come up with a solution soon!