Install it by your mod manager and let overwrite other files with same name.

For the latest ENBSeries. Manual installation

For users that like the black bars at the bottom and top of the screen. Pick the option for your resolution , paste the enbeffect.fx file inside enbseries folder and overwrite the other one.

A more performance friendly DOF effect, which can give about 7 to 15 FPS depending on your system. Put the files in enbseries folder and overwrite the other ones. Credits to Marty MCFly for the ADOF shader.