1. Probably doesn't work for warlords. 2. After extracting files, start civ4. In main menu go to advanced, load a mod, and select trade routes. Or make a shortcut with target like this "C:\Program Files\Firaxis Games\Sid Meier's Civilization 4\Civilization4.exe mod= traderoutes", but change the path to whence you run the game if necessary. 3. Extract to your mods folder, C:\Program Files\Firaxis Games\Sid Meier's Civilization 4\Mods. Change the path if necessary.