SdFat.h No such file or directory

Hello how can I fix this Problem
I’m a Arduino Beginner with a DUE Board.
This is a part of sdFatTftBitmap

#include <SPI.h>
#include <SdFat.h>
#include <SdFatUtil.h>
#include <ILI9341_due_config.h>
#include <ILI9341_due.h>

D:__Dokus\Documents\Arduino\ILI9341\examples\sdFatTftBitmap\sdFatTftBitmap.ino:23:19: fatal error: SdFat.h: No such file or directory

#include <SdFat.h>

^

compilation terminated.

I can Compile SD.h

It most likely means that you don't have an SdFat library installed. This isn't a standard Arduino library, so you have to download one (usually from Github).