I haven't played this game in a while, but I own GalCiv2 and the Twilight expansion (I have the reciept e-mail right here).
When I try and start up Twilight I get a message saying.."Twilight of the Arnor appears to be installed, however Dark Avatar is not. Both expansions must be installed to play Twilight of the Arnor."
I don't believe I own DA as it's not tied to my account and I don't have an email from stardock with a reciept.
What am I missing here? Do I really have to pony up $25 more dollars to be able to play the game I already purchased?