Installation: 
Copy the content of the folder "Need for Speed Payback - Reshade" to the game main directory. 

Deletion: 
Delete the folder "reshade-shaders" and the files "dxgi.dll", "dxgi.ini", "NFSP.ini", "dxgi.log". 

Using the reshade preset: 
The preset is enabled by default. To disable or enable the preset press the Scroll Lock key. 

Download: 
http://www.mediafire.com/file/glikq4s3d2wap8b/Need%20for%20Speed%20Payback%20-%20Reshade.rar