While there is no separate, standalone download specifically for "DirectX 11" on Windows 10, you can update or reinstall your DirectX libraries through the following methods. How to Check Your DirectX Version
Yes. While Windows 10 uses DirectX 12 as its native standard, it fully supports DirectX 11.0 and 11.1 hardware. If your graphics card is older and only supports DirectX 11, Windows 10 will run it perfectly. directx 11 download for windows 10
In the tab, look for DirectX Version at the bottom of the "System Information" section. While there is no separate, standalone download specifically