I need a serial code

[NeedSerialCode]

I bought the discount bundle for 5$ after donating to the game list. I can play the first one but I dont want to have to have 2 copies installed until I get my serial code, where do I go to get it? it wasnt in any of the pdfs included in my copy so im curious where to get it, when it popped up it was just a bunch of zeros.