There are no official Windows 11 drivers for the EAH5450. Most users find that the Windows 10 64-bit legacy driver works through compatibility mode.
Are you having trouble with a during installation, or is the card not being detected by your system? EAH5450/DI/1GD3(LP) - Техподдержка - ASUS
Run the downloaded .exe installer and follow the on-screen prompts.
Select your operating system (Windows 10, 8.1, 7, etc.) to access the validated or Crimson Edition Beta drivers. AMD Official Legacy Drivers: