RA3 Serial Number Invalid?
I own a legally purchased copy of Red Alert 3 and when I try to play, it says invalid serial number. I think it's talking about the installation code, but if that was wrong, then why did it even install? I can still play alone, just not online.
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http://www.videogamesblogger.com/2008/10/30/red-al...
You should contact the manufacturer.
Also check for CAPS letters and the difference between O and 0 which i see a lot of ppl with that problem
Good Luck!