The Sheltering Sky: Colorado by Night, is what's known now as an oWoD game. The publisher of the systems has released a new set of games with similar names, but with significant differences. These are collectivly known as nWoD. The systems in use here are:
Hunter: the Reckoning is not supported.
What this means is Vampire: The Requiem, Mage: The Awakening, and Werewolf: The Forsaken are not used here.
If you need to get a copy of the books, take a look at http://www.drivethrurpg.com where you can purchase PDFs of the systems, and the additional books. eBay may also have some copies available