It seems you got further when attempting to startup the Epic Games Luancher. This time I see that d3dx11_43.dll is having an issue. Can you try the same steps we ran through before but this time on d3dx11_43.dll. This means you’ll have to run the directX install one more time(hopefully for the last time). I’m still not clear why some directX files would fail to install properly. If I could get my hands on someones backup DLLs and DirectX isntall logs I could probably track things down better. In any case, here are the steps again:
FIX d3dx11_43.dll
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Download the Dx11 redist from here: https://www.microsoft.com/en-us/download/details.aspx?id=8109
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Find and backup your current C:\Windows\System32\d3dx11_43.dll. You can do this by renaming it to d3dx11_43.dll_BACKUP
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Install the DirectX11 Redist.
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Check to make sure you have a new d3dx11_43.dll
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Try running the launcher again.