If you want to get SweetFX to run using the DirectX 11 version, you have to first start the game --WITHOUT-- installing SweetFX, and on the loader that comes up, select DirectX 11, your resolution, etc. BEFORE PUSHING PLAY - load SweetFX into the game's root directory, and THEN press play. If you already have SweetFX loaded, the game loader will not let you choose DirectX 11.