I installed BTS Steam but I still had the mygames\bts folder on my computer and it automatically took that over and used BlueMarble without problems!
Unfortunately due to my stupidity I had to wipe that folder (Mod problems). And I couldn't get it back the way it was.
However I did find a way for it to work with Steam
Quite simple actually: Rename the Civ4BeyondSword to Civilization4
Then in the installer paste the exact file name in there so e.g.:
C:\Program Files (x86)\Steam\steamapps\common\sid meier's civilization iv beyond the sword\Beyond the Sword\Civilization4.exe
(Don't forget the .exe or it doesn't work!)
It installs Blue Marble without a hiccup. However it doesn't show the BlueMarble logo on start up and it seems to be stuck on the golden background...
Still ColdFever, I did had a perfectly working version however as I said that is probably older and was in mygames/bts folder... So perhaps installing cd/dvd version -> installing Blue Marble -> Installing Steam version does work, so it should be able to work without first having to install the dvd version, or? I understand you don't want to test out every downloadable version out there but maybe the solution is simple?
Ok seems to be a name issue. When I rename the Main Menu folder to Civ4 Main Menu in CustomAssets\art\interface you get the Blue Marble screen again.
Can you tell me what folder which file is where it determines which colour to use? Could be really helpful.