You can download the USB driver for PixMax model cutters by clicking here.
To install the USB driver once it has been downloaded, unplug the USB cable from your computer then open the downloaded file and extract all files. Then click on the folder named CH341SER, once that folder is open click on SETUP.exe A window will open on your computer screen where you need to click on INSTALL to install the driver. Once installed, connect the USB to your computer then you should find a new COM port in the cutter setup window in SignCut for your cutter. (Click settings then cutter to open the setup window)