Modern versions of Windows, including , do not allow you to install DirectX 8.1 as a standalone package because it is considered an obsolete version . Instead, Windows 10 comes pre-installed with newer versions (DirectX 11 and 12) that are designed to be backward compatible.
Many games from the DirectX 8.1 era rely on a component called , which is disabled by default in Windows 10. Press the Windows Key + R , type appwiz.cpl , and hit Enter . Directx 8.1 Free Download For Windows 10
Run the installer and (like the Bing Bar) during setup. Modern versions of Windows, including , do not
[Windows Features] └── ☐ Internet Information Services └── ☑ Legacy Components └── ☑ DirectPlay <-- Ensure this is checked! Modern versions of Windows