First, understand that Feature Level 10.0 is not a standalone download. It is a capability set built into the DirectX 11 API. You do not install Feature Level 10.0 like a driver or an app.
You can download the DirectX 11 SDK, which includes DX11 Feature Level 10.0, from the Microsoft website: dx11 feature level 10.0 download windows 10
-featurelevel 10_0 (varies by game).If you are seeing this error on Windows 10, try these verified steps to ensure your system is performing at its best: Launch your game with the parameter: -featurelevel 10_0