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, or download here. STEPCRAFT will always have the latest compatible version of UCCNC included in the Multi-Installer. If you are looking for the newest released version of UCCNC, you can download here (note: UCCNC may release versions newer than those included on the STEPCRAFT Multi-Installer. These versions may not have been fully tested and may cause some bugs/issues with your machine. It is reccomended to use the version of UCCNC included on the STEPCRAFT Multi-Installer).