If you cant find your serial code, Clickteam sends it back to you, dont know how long it normally takes though because my serial code is still tapped in the bottom left hand corner of the box. I do know that it takes them about 1-2 days to send me my TGFPro code to me when I lose it so you might get it within that time.
you can get your serial sent to you again, free of charge ? i must have them do that. My serial came on a piece of A4 paper with the serial printed out. I would much have preferred my serial being printed on a small sticker and put inside the box, much like everything else with a serial, that i ever bought... >_<