Click Install to install the driver. When the installation is complete, this message will appear: Install done!
Click Exit to close the dialog box.
To verify that the driver is installed correctly, go to Windows Device Manager. In the Ports (COM & LPT) field, you should see the entry for Prolific USB-to-Serial Bridge.
Remember the COM port showing in the Prolific USB-to Serial Bridge entry. It
indicates the port number that the Keyboard is using.