Windows 11 enforces strict driver signature requirements. If the extracted drivers (specifically the .cat catalog files) do not contain a valid Microsoft-accepted digital signature, the installation will fail unless the user disables "Driver Signature Enforcement" in the Windows Recovery Environment (not recommended for security reasons).
Only download this file from official manufacturer support pages (e.g., Realtek's official site ) or your PC manufacturer's portal. Avoid third-party "driver downloader" sites, as they often bundle malware. rtk-nic-driver-installer.sfx.exe windows 11
Concise troubleshooting checklist