Don’t worry. You don’t need to downgrade to Windows 7. Here’s the real solution.
The JK-721 does not work like a standard office printer; it requires vector-based cutting software. Ricoma Blog Important Installation Instructions Jk 721 Cutting Plotter Driver Windows 10
Many JK 721 plotters use a USB cable that actually contains a USB-to-serial chip (often Prolific PL2303 or CH340). You must: Don’t worry
: Use the driver disk provided with the machine or download the CH341SER driver . Run the installer before connecting the plotter via USB. Jk 721 Cutting Plotter Driver Windows 10
Avoid shady “driver download” websites that require you to install an .exe file without a digital signature. These often contain malware.