Official Realtek Website: The safest source. Navigate to the Realtek "Computer Peripheral ICs" section to find the latest version.
Sometimes, the installer fails. Use this method: Official Realtek Website: The safest source
If you have followed every step and your adapter still fails, it is likely a hardware fault. The chipset can overheat; a $10 replacement is often simpler than endless debugging. But for the majority of users, the right driver is all you need. Official Realtek Website: The safest source
The community-maintained driver by clnhub (or the ulli-kroll fork) is the gold standard. Official Realtek Website: The safest source