There ist no error message - just the COM port of the Nano is not recognized.
Btw.: I just found a way to get the win10 drivers that are available on a number of sites installed.
- get and unpack the win10 drivers to some folder on your HDD
- check your Windows Device Manager
- a connected Nano will show under "Ports" as CH340 device (without a COM port)
- right click and uninstall the device with everything
- dis- and re-connect the Nano - it will again show up in the device manager
- right click and search for new drivers on local HDD - find the folder with drivers from step one
Now the device will show up with a COM port