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).
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
Try a different USB port (preferably a USB 2.0 port if you are on an older machine). Since the KY-888 is often a white-label product,
Typically uses the Realtek RTL8152 or Corechip SR9900 series. Ky-888 Usb Ethernet Driver REPACK