No I meant the unoffical patch for Civ 4: BTS... Look at the menu bar that starts with Gome and goes to Logout. Click on Downloads. Then Civ IV Downloads. Then Civ IV patches and downloads.
If you don't have the patch (I'm using 3.17 unoffical, last I checked, myself with little issue) you can run into random errors as the mod calls on things that don't do what it thinks they will and such. I remember doing this in v10 and it made many of my issues disappear. While v18 is far, far, far more stable, the are using that patch as a required thing last I checked.