Where to find my registration code?

I bought GSB including all DLCs a while ago, and today bought the campaign addon. I never tried the multiplayer part of the game, and now I can’t find my registration code anywhere, would be great if someone could help me out.

In …My Games\GratuitousSpaceBattles\web… the files are gsbcd and gsbcdu.

Not sure that will be intact if you did a new install.

Then the BMT Micro email would be your best chance (to redownload the app), or email cliffski?