4dat,
You should call your credit card company and cancel the charge. It's very simply to do and people do it all the time. That is pretty much ridiculous if CrackDAT has no phone number to be able to reach them.
Its a shame though, cause one member has mentioned that she really enjoyed the program, if it would just download.
Also, run a search cause there was a thread mentioning that same error message and some way to get around it.
Good luck, but definately try to reverse the charge, no way you should pay for something that doesn't work.