Hello. Please download the DirectX patch from the Microsoft website linked in the description above.
This no longer works on Windows 11. DirectX 12 comes standard with that, but it still throws that error. The installer you are pointing to no longer works on Win 11, as all those files installed are already provided by the OS, so the installer throws an error. Works on my Win10 desktop with no complaints, yes, but my work laptop (with rly good specs, it's not a graphics card issue) with Win11 refuses entirely.