Well, as long as you don't need to save, the demo will work... other than that, double-check to be sure you have the right license number and the right email address, and that you haven't used it on another computer. After that, well, you hope support gets back to you soon.
I'd say you did the right thing posting here, just in case they can help. I don't know if there's anyone else to PM as "on-call" for this sort of situation.