You're looking for drivers for the RD9700 USB 2.0 to Fast Ethernet Adapter on Windows 11. Here are some helpful steps and resources to download the drivers:
(approx. 5–12 Mbps), even though they are advertised as "USB 2.0 Fast Ethernet". If you require speeds closer to 100 Mbps, you may need an adapter using a more modern chipset like the Realtek RTL8152 exact Hardware ID You're looking for drivers for the RD9700 USB 2