Thanks to another user - here is the CONFIG information for the 2013 Navigation update, Part# 22991499:
Application - V5.00.000
Map DB - 14.114.23.032812.1e - March 28, 2012 release date.
New site for NAV updates - http://allthingsnav.navigation.com/
The infamous 2012 update was dated 053111; the application was V4.11 I believe.
No problems encountered installing the software and map and the install time remains somewhat over 2 hours as normal.