[Solved]Where can I find my serial number

[SamTDS]

I bought FSP awhile back well when the last update came out, I updated it but now it's unregistered and I can't find my serial number to reactiavte it so right now I am stuck in Demo mode :/

first where was it purchased from? if it was flightsimstore of simmarket then you will need to login to your account there, if it was with paypal then you need to email dan about it along with something that can prove your identity to the purchase such as last 4 numbers of the card or paypal email