If you are using Nuvoton development tools like the Nu-Link2-Pro, you may need specific virtual COM port drivers (e.g., Nu-Link Virtual Com Port) provided in the Nuvoton NuTool toolkit . How to Install the Nuvoton Communications Port Driver

For Windows 10, the "best" driver is generally the one provided by the Original Equipment Manufacturer (OEM) of your motherboard or PC. Manufacturer Support Pages