I am stuck attempting to locate and download the sector file for ZAU.  I have searched and poked around the websites of both vatusa.net and zauartcc.org, but I've been unable to find it on either site. Perhaps I missed something obvious.

Advice?

If it matters, I am attempting to use the VRC client software to connect as an observer in the ZAU sector.  (I am near KCMI in real life, and would like to observe KORD as a starting point to learn about VATSIM).