Found my old copy of cortex command and brought it over to my new computer, but the register key isn't working. my dad changed his email address recently and i lost track of the key i wrote down. is there still a way to recover the access code?

e-mail me a proof of purchase?

Where would i find the proof of purchase? was it in the file or in a different location?

In your email, after you bought it.

that's one of my main problems, my dad changed his email a few months back and I'm not sure if he can access it. I'll check with him though, just to be sure.

Yeah,I've got essentially the same problem.
I bought the game back in b23 or so and when my previous computer broke I lost my only copy of my code for the game,let alone the fact that the email adress that was used to buy it no longer exists.
What now?I don't want to pay for the game again when it comes on steam and I loved this game to bits when I had it before.

And I even don't remember did I buy CC or not...
I have mail "Getting Cortex Command Full Version with TrialPay", but no key. %)