This is the final official Living Rosters update for NBA 2K11. Thanks to benji for the re-upload!
The included files need to be placed in your Saves folder.
XP/VISTA USERS: Go to the Start Menu and click Run. Type in %appdata% (with the % signs). Then click 2K Sports, then NBA 2K11. Here you will find a folder called Saves; this is where you need to extract the files.
WINDOWS 7 USERS: Type %appdata% in your Start Menu's search bar and press Enter. It will take you to your Roaming folder, where you can click 2K Sports and then NBA 2K11. Place the files here.