Like topic says.
Invalid serial number, but I bought it today. I have re-installed the game and typed the serialkey several times, but still the same problem.
I've searched the web and I can see that more people are having the same problem, but I couldn't found any solution to the problem anyway.
The most topics I found where related to steam issues, but I don't have steam.
I only bought it to play against friends online or LAN.
I have the original game (CD) and the serialkey in the case, and not a digit version like Steam.
Please help me (and others) with this problem.