Windows 64-bit versions block unsigned drivers by default. Since older NCStudio drivers are often unsigned, you must temporarily disable this security feature: Go to . Under Advanced Startup , click Restart Now .
With the rise of Mach4, UCCNC, and LinuxCNC, you might ask why anyone would seek out an "older" version like V55601.
However, if you need or automatic tool changing (ATC) , V55601 is limited. You would need NCStudio Pro (which is a different ecosystem).