This really isn't a bug as such, but rather a licensing and install question. I purchased GalCiv2 when it first came out, and registered the serial number through Stardock Central (the license transferred to Impulse of course.) I haven't had a whole lot of time to play since, so I never went and bought the expansions. At PAX I saw the special deal for picking up GalCiv Gold + Twilight of the Arnor, and I jumped on it while I had the cash to blow.
I specifically asked the person behind the counter if I would be able to install the expansions, but give the core GalCiv game away since I already owned it, and he said I could. However, in the box the registration code is for the GC2 Gold edition by itself, there aren't seperate codes for Dark Avatar and GC2.
Is there any way that I can give my extra copy of GalCiv 2 basic away, either by removing the key for my original copy from Impulse, or by somehow splitting up the install of my new GalCiv Gold copy? I'd like to not be stuck with two copies of the core game if at all possible.