If you have a CrossFire PRO or a CrossFire XR, you will use FireControl. If you have a new CrossFire machine, you will use FireControl.
If you have an older CrossFire machine, or a used CrossFire machine, the first thing you will want to check is whether your CrossFire machine uses Mach3 or FireControl. There are cosmetic differences between the CNC control boxes that indicate which software to use. Mach3 CrossFire machines have colorful blue, green, red, and yellow markings around the ports on the control box whereas FireControl CrossFire machines have more simple white and burgundy markings around the ports.