Windows 11 handles legacy serial drivers similarly to Windows 10. If you get the ROHS 721 working on Windows 10, the same driver will continue to function after an upgrade to Windows 11. However, avoid upgrading mid-project—test first on a backup system.
Windows 10 may sometimes block "unsigned" or older drivers. To force the installation: Can't install driver for CH340 - IDE 1.x - Arduino Forum rohs cutting plotter 721 drivers windows 10