Unplug your Ranz adapter, right-click it in Device Manager, select , and go to the Details tab. Select Hardware Ids from the dropdown to verify if it is a Realtek device (look for VEN_10EC , which stands for Realtek). Go to the official Realtek Downloads Center website.
Automatically installs via Windows Update in 95% of use cases. Manual Driver Installation Required ranz usb to lan adapter driver