So today I bought Rainslick: Precipice of Darkness on Impulse, my order was processed etc. etc. and it's on my games list, but when I try to install it I get that message. Serial number not recognized only serial numbers provided by Stardock are valid (who provided this one then? The tooth fairy?).

I've tried manually re-entering the serial number and get the same message, had a confirmation of the number sent by email and it's the same number.. so what's up? Frankly I'm not impressed by Impulse thus far, not only do we have regional lockouts, now apparently I don't have access to a game I just paid for!