Remember that the KY-888 is a 10/100 Mbps device. It will not reach Gigabit (1000 Mbps) speeds.
Since the KY-888 is often a white-label product, the safest drivers are usually found on the Realtek official website (search for RTL8152 drivers). Ky-888 Usb Ethernet Driver REPACK
Disable "Energy Efficient Ethernet" in the device's via Device Manager to prevent drops. Limited Connectivity Restart your router and the computer. Remember that the KY-888 is a 10/100 Mbps device
What are you using? (e.g., Windows 11, macOS Sonoma) Did the device come with a small driver CD ? Do you see any error codes in your Device Manager? Ky-888 Usb Ethernet Driver REPACK
If you are having trouble finding the specific file, I can help you identify the right one. Let me know: