Nostalrius Begins - Quality wow vanilla realm (1.12)

Whenever I try to log in, instead of taking me to my character screen, it says "Patch Required: Press Quit to Download Patch." My only option from there is to hit the quit button.

As far as I can tell, there isn't a new patch out, and I've searched the forums and haven't seen anyone posting a solution to this.

Any help with this?