TC01
Deity
So in what directory this mod has to be installed?
If you have the "regular" install of BTS (that is, you bought Civ 4, then BTS), it will be:
C:\Program Files\Firaxis Games\Sid Meier's Civilization 4\Beyond the Sword\Mods
If you have this installed on a 64-bit system, substitute Program Files (x86).
If you have the Steam install, or the Civ 4 Complete install, it will be a bit different. But it will be somewhere in Program Files, or Program Files (x86).
However, the installer should find it automatically.