I have Civ IV installed. When I try to install BTS, it tells me that 1) "there's a newer version of Civ IV available -- installing now." Then it tells me "The patch failed to install. Aborting installation!" I have downloaded both the 161 and 174 patches, but when I try to install those, it tells me that "the setup has detected that no version of Civ IV has been installed. This update requires that a previous version of the application be installed." Help, please!