Uhm… I followed your guide and get error when I opened the map for VXGI in Maps folder.
It crashed.
I run Setup.bat from here: https://github.com//UnrealEngine/tree/4.8p3_VXGI_FleX_HW_HBAO
Run the GenerateProjectFiles.bat.
I copy the libs from NVIDIA/nvapi/… and paste.
I built UE4.sln and rebuilt ShaderCompilerWorker.
I managed to open version 4.8.0, it runs well.
But failed and crashed when open VXGIExample.
Could you help me, ?