CH340G Driver
From DISCO3.CO.UK Knowledge Base
Please find below a mirrored link of the Windows driver for the CH340G USB-Serial adapter which is used in the ~£5 USB-to-OBD2 KKL adapters.
These adapters can be used for Webasto FBH diagnostics.
This version: 3.3
Link: https://dl.dropboxusercontent.com/u/233740/sites/CH341SERv3.3.zip
This file should be unzipped and the "setup" application run from the CH341SER folder.