HOW TO:

1:.:Extract and copy folder and files from .rar archive, into your "Red Dead Redemption 2" game root folder.

2:.:Open Reshade installation, select RDR2.exe
    Then Select "WesternPreset".ini file, when asked about choosing a preset
    Reshade will automatically install all the needed effects and apply the preset when launching the game, 
    if it somehow does not, open Reshade by pressing Home when in-game and select WesternPreset.ini

3:.:Done