Main files
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Open the Zip file and put the two .ini files and the reshade-shaders folder in your game's "Game" folder where your game's .exe is.
Update files
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This should be considered an alternative to the main Photorealistic preset, not a replacement. I felt fires weren't quite orange enough, but making the fires warmer also means making the overall image warmer, a bit, which I don't prefer. Try both.