It's a zip file of eleven (11) rosters, each with different purpose.
More details are in the forum thread.
Versions:
2.0 - December 10, 2016
1.0 - December 5, 2016
Version 2.0 also contains LASquared Roster Pack for NBA 2K12 12/05, with three (3) rosters from NBA 2K12.
Base rosters:
NBA Live 08 default rosters
NBA Live 08 NLSC 2012/2013 Roster Update by Andrew
NBA 2K12 Final July 2012 Official Roster Update from 2K Sports