I posted this same question several days ago. A "moderator" named "flipside" closed the thread instantly, and gave a useless link to an unrelated topic. There are now no less than 4 such threads about the much appreciated Availabilty Tool 1.64 in various FT forums.

http://www.flyertalk.com/forum/showthread.php?t=400877


Regardless, it would seem that the datasource has been cutoff, and this useful tool has gone the way of Expedia Fare Listings, ITN.net, and Galileo.

My somewhat esoteric tip to this community is AMEX Platinum Travel:
http://www.itn.net/cgi/get?itn/pl/ctnplatinum1/index