Your Customer Number is required for ALL customer support correspondence and is your proof of ownership of the Final Draft license. The number looks like this: K or E or XFD?-AB1C-AO1A-OABC-ABCD. FD12 / 11 / 10 gift card: On the back (after the coating has been scratched off).FD12 / 11 / 10 download: In the emailed receipt.If it's not in the program under About Final Draft: Windows: Go to the Help menu at the upper right and choose About Final Draft. Mac: Go to the Final Draft menu at the upper left and choose About Final Draft.