Extract SweetFX files in the root directory.
Game has to be played on "Medium" settings, changing it to "High" or "Very High"
disables SweetFX, I assume the game applies AntiAliasning which interferes with SweetFX
but is disabled in-game when "Medium" or lower is selected, unless someone manages to
find away to disable in-game AA via another means, you must play at "Medium" if you
want SweetFX working.