Try a different USB port or restart your computer. Sometimes the USB hub needs a "refresh" to detect the new NIC (Network Interface Controller).
These issues almost always resolve after a successful and installation. glaabit usb 3.0 gigabit lan driver download
Ensure you are using a USB 3.0 port . If you plug it into a black USB 2.0 port, your speed will be capped at roughly 300-400 Mbps instead of a full 1000 Mbps. Try a different USB port or restart your computer