I haven’t had time to write the full guide yet but here are the drivers.

The Arduino Nanos I supply use the CH350/CH340G serial interface chip made by WCH. Drivers for Windows, Linux and MAC are available from the manufactures website:
exe installer
zip file

The WCH website is in Chinese but all you need do is click the blue download button:

The Windows zip file can also be downloaded from dropController.com.