Xmod 1.8 is the final one released. The previous versions all had one minor bug or another in them, usually not relatted to working the gun, but to the software itself. There are also different versions of 1.8 with different start points for the ramping. (Since there isnt enough room on the chip to make it user-adjustable, Lornecash just made a few different versions)
To get the Xmod software you are supposed to purchase a programmer from Lornecash. Go to http://www.niedtech.com/ for more info.
Home of the Nice, Nice AutoMag people