Something that the base model Of Civilization IV BTS that wasn't included was the ability to build . With Writing you can build , Drama , Currency and now with Paper .
I tried to do this when you researched Alphabet, but it was too powerful so I changed it to Paper. Anything later would have been too late in the game, so it's at the sweet spot.
Installation Instructions -
1: Copy all contents into
Program Files (x86)\Firaxis Games\Sid Meier's Civilization 4\Beyond the Sword
And that's it!
Build Espionage 2019-09-09
Add on for BUG that allows you to build espionage