Checking the Windows device driver properties shows nanovna to be using ChibOS/RT Virtual Com port and Windows recognizes device being attached / removed.
You could replace that driver with this:
Virtual COM port operation to nanoVNA can be confirmed using .e.g putty.exe
I don't bother with a .msi installer; the standalone .exe works fine.
Try sending `help` from putty:
/g/nanovna-users/wiki/shellcommandsNanovna-Saver uses pyqt5, which can be separately tested:
`python -m serial.tools.list_ports`
COM3
1 ports found
NanoVNA USB driver is STMicroelectronics Virtual COM Port 8/2/2013 1.4.0.0