I read where people were also having the problem with Windows 11. They seem to be making it work by using a Tripp Lite Keyspan Adapter with the serial cable that came with their cutter. The Tripp lite has it's own driver. Tripp Lite is the brand name and has always been recommended to use with value cutters anyway. Much better than the USB on the cutter. Value cutters have a cheap Chinese chipset in them. Not TRUE USB like higher end cutters.