Where should I put it in?
Everyone who I've talked to happens to have the retail version, and they are asked for their multiplayer key upon installing. This was not the case for me. I've searched through everything on the menu and took a peek at the game files, but didn't find anything.
When making or joining a multiplayer game; i get "connection end" and then "invalid serial key".
anyone else having the problem or know how to fix it?
Thanks a ton,
-R

I just requested mine and asked how to enter it. If I find out before you I'll post here.

I have found the place where the CD-key is in the registry
in
Computer\HKEY_Local_Machine\software\microsoft\windows\currentVersion\Spellforce
i could write a c# application that would allow users to enter there own key.
please get me know if any one what it.
I'll request my key too. just to see if it is the right place in the registry
Greetings Entvex

Almost ...
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SpellForce
Hopefully GoG.com will provide either a .reg file or a utility that does this, but if not, perhaps someone would be interested in such an app.

Cool, that's probably the easiest way to go.
Question: How long did it take you guys to get your key? Just curious so I can stop checking my inbox. :P
Edit:
I just received the .reg file via email.