OK, I finally got this to work all the way through for the first time since I downloaded it about two months ago. To anyone downloading it, allow me to offer some advice:
First, downloading this is like getting a brand new game. It's just that awesome. You will love the hell out of this mod. Which brings me to my second point, which is you will loathe the hell out of this game, as well, due to the glitches and bugs found in one particular unit. I lost whole weeks of game play because of these glitches, as there's no way to fix it in-game, you have to start a new one. Save yourself the hassles and do the following:
Open up the Balancer file in your own editor and find Swordsman. Down at the bottom where it tells you who can use that unit, make it blank. Then go through and remove every single other swordsman unit, besides the Legionary (un-highlight them entirely from the "used by" section). Once that's done, you must also remove a few more Feudalism swordsman units (Knights of Anubis is one, but I simply removed 100% of them and gave all civs Medieval Warrior).
That's the quick fix. There are other ways to do it, some of which were posted earlier in the thread (none of which worked for me whatsoever), but this is the only 100% guaranteed way that I've found to play a game through to the end (finished with Rome, working on Germany now, so I'll see if I can finish this one too).
Other than the problem I mentioned, which are so glaring that you want to break something after spending a week building your civ, only to have the friggin Zulu find Iron and build a damned swordsman, thereby crashing the game eternally to desktop, other than that problem, this will be the only way you ever play CivIII again. It's that good.