If you don't have internet access on the target PC, use another computer to visit the manufacturer's website (e.g., Intel , Realtek, or your laptop's brand).
If you're using Windows, you can also install a network adapter driver from the Device Manager: how to install driver for network adapter
This is the standard way to update or reinstall a driver if your hardware is detected but not working correctly. Microsoft Support Open Device Manager : Right-click the button and select Device Manager Locate Adapter : Expand the Network adapters If you don't have internet access on the
This solves the no-internet paradox.