I've tried to register Hearts of Iron 3 but it doesn't do anything when I submit the key. I don't know why this happens. I'd be very grateful if someone helped me.
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This thread should help
http://forum.paradoxplaza.com/forum/showthread.php?547980-Game-Registration-Key-FAQ-Look-here.
http://forum.paradoxplaza.com/forum/showthread.php?547980-Game-Registration-Key-FAQ-Look-here.