Was the last time you played before we went to Steam? If so, purchase of the game through Steam is now required, unless you bought one of the backer packages through Kickstarter, Indiegogo or the alpha version of the Gorgon Shop.
If you bought a backer package but cannot find your e-mail, then you need to contact
[email protected] and give them as much information as you can so they can look up your package and resend the info.
If you are just looking for your alpha account info so that you may link your alpha account to a Steam account that has purchased the game, you will also need to contact
[email protected] using the e-mail address that is connected to the alpha account.