I didn't find any info on this topic but dead ends. I found away to make it work with steam civ bts game. Once you installed blue marble patch it will only work with Civ4 vanilla. Under your mygame folder go into the civ4 vanilla version and copy the civ4 INI file. Next goto your BTS folder (under mygames still) and over write the INI file. Once I did that and started a new game I noticed the graphical changes. Make sure you run vanilla civ4 so it shows up in your mygames folder.
Cheers.
Cheers.