JMich: I thought
this was the message displayed, was it changed? Granted, that is from August of 2015, but I haven't had a chance to test it since :/
Destro: Nope - currently if you don't own the game, Galaxy goes into offline mode for that title. TW3 might be an exception for the rule as it had custom text on its game view. Then, when you click Connect, you get to redeem page, as OP described.
I do own the game because someone gifted it to me. Besides how I got the game has nothing to do with Galaxy require promotional codes just to get online with it. Which is the point.
I'm done with this topic now before any more stupid comments get posted by ignorant people that want to keep making excuses and exceptions to this piss poor garbage of a program.
I don't need a damn promotional code to go online with a service which has nothing to do with the game just to use a game that was gifted to me.
GOG is forcing people to use promotional codes and such, just to be allowed to access the online portion of GALAXY that is already online.