Mach3 should start as a licensed version.

Before installing the UC300ETH plugin, copy the license into the mach3 folder and start the program. Uninstall the previous version of mach3 and install the version R3.043.062 that runs under Windows 10. Probably, when updating windows10, there was some error in assigning the right of access in the previous version of Mach3.Īs Gerry suggests, you can try a fresh installation of Mach3. I guess the mach3 license is ok because you wrote that the program works with the selected parallel port. In the case of Windows 10 you should use Mach3 Version R3.043.062 which you can download from.