If it did not require a USB driver then it is not a UC100, but a chinese fake controller.
The UC100 requires a USB driver to be installed, but our UCx00 automatic installer application available for download on our website takes care of installing both the USB drivers and the plugin.
With the chinese controller you don't need to install a USB driver, because it works as a HID device, so the driver is installed in the OS which can only throughput 64kb/sec data max., so it is far slower communication as what the real UC100 does, and so the motion path will have a much lower resolution, because the speed update loop can be be about 8 times slower than it is with the real UC100.