Quick run through on what worked for me....
1. Download and save file to desktop
2. Unzip file using Winzip or something comparable and save it to the XChange360 folder. This folder seems to appear in different places for different people, sometimes its in My Documents, and mine was in Program Files.
3. Once you open the XChange360 program check the options blade and make sure that the directory is correct for where you have your Xchange folder located otherwise it wont work. ie. Mine was default to My Documents, once changed to Program Files it worked like a charm. Hope this helps.
There are also directions located in Playmakers Rosters for NBA Live and an entire sticky in the Non Sports Gaming Forum.