
1.  need reshade Version 6.3.3_with full addon support or reshade with api 12 or newer

2. soft requirement 
   fake free aim   https://www.nexusmods.com/stalker2heartofchornobyl/mods/636?tab=files 
   
   
3. Download Fgfx
https://github.com/AlexTuduran/FGFX/blob/main/Shaders/FGFXLargeScalePerceptualObscuranceIrradiance.fx

4. install the freeaim mod shaders then load the preset