UCCNC is the machine control software that moves your STEPCRAFT machine and interprets G-Code. In order to use your STEPCRAFT machine, you will need the UCCNC software as well as the STEPCRAFT machine-specific profiles. You can download and install both from the STEPCRAFT Multi-Installer that comes on your orange USB flash drive, please email support@stepcraft.us to get a copy.  STEPCRAFT will always have the latest compatible version of UCCNC included in the Multi-Installer.