The source code is in Subversion. Download Tortise SVN and check out https://j1939-84.svn.sourceforge.net/svnroot/j1939-84/trunk
If you just want the executable, go to the J1939-84 Project Page and click on the big green 'Download' button. We will periodically release compiled snapshots of the SVN repository. You will need a J2534 Pass-Thru device and a heavy duty OBD (J1939) vehicle. It does not work with J1708 trucks. After running, there will be a .log file that contains a log of everything that happened. The log file is extremely useful for troubleshooting purposes.
Special thanks to SourceForge for their hosting of software development tools.
If you like this project, you may also like the J1699-3 Light Duty OBD-II test implementation project.