With the new patches being released, installing them will obviously prevent games with "protected assests" from previous patches working. The "easiest" solution for GOTMs / WOTMs is to just finish your current games before applying the patches. The alternative is to create a copy of your full \SId Meier's Civilization 4\ directory, and use it to play the GOTM/WOTMs whilst you apply the patches to the original directories (a "dual install"). Please note too: Installing BTS automatically patches your Civ4 (and warlords) installs. You don't even get asked for confirmation.