Damn, I'll look into it. This is the link we use, it's the only working one it seems.
http://www.moddb.com/mods/north-south-first-manassas/downloads/north-and-south-0404-full-clientI'll ask the devs about it, but if you're interested, you can also enlist in our NW counterpart until you can get NaS to work. We also will be the 39thNY in Battle Cry of Freedom, so if you're willing to wait, you can always join in for it. Again though, NW is where we're mostly focused, with only one NaS event a week, so I'd recommend joining it. It's simple to join the [1tes]Pmrs, all you have to do is add me on Steam.
EDIT: The first dozen enlistedmen are in! Once the participating [1tes]Pmrs members get signed up officially, all new applicants will receive Recruit on enlistment. Everyone who joins in before them will get Private to start off as. There's about 6 remaining [1tes]Pmrs people who haven't signed up yet, so there's still time!
http://39th.enjin.com/enlist