Software modules are sold individually per OEM manufacturer or application. You would be needing the VMAC III step 8 software. It comes on a pcmcia card that also fits into another cartridge adapter that nexiq sells. You can test (engine brake test, chassis dyno, cylinder balance, cylinder cut-out e.t.c) and reprogram (road speed, engine shutdown parameters, PTO options e.t.c) anything from 1998 but you cannot reprogram chassis built after I think November 3 2003, you can only test on those chassis. To reprogram your '04 Vision you might need to get the VCADS or PTT software and adapters from a Mack dealer. Search ebay, I'm sure you'll find what you're looking for.