GO TO VERSIONS , AND DOWNLOAD THE SUPLEMENTARY FILE . OTHERWISE IT WILL NOT FUNCTION
ABOUT THE SHADERPACK
deprivation is meant to be a grey , WW1-WW2 inspired shader with pretty decent performance This will go in clutch with Horror mods/packs or War modpacks
IMPORTANT
I do not own the rights to BSL shaders, what i just published is a specific edit/config of BSL shaders
This is currently in Alpha i encourage you to report any bugs to me and if you make a youtube video about it credits would be nice
again , this is a Config of bsl shaders i only included it for easier download updates will come based on your suggestions , may add fog or vignette by coding next
INSTALL GUIDE (OR README) Youtube Tutorial : https://www.youtube.com/watch?v=WguFqUJRyaw&t=17s INSTALL THE CONFIG ZIP AND BSL SHADER FROM HERE PUT THE CONTENTS (BSL SHADER ZIP AND CONFIG FILE) IN SHADERS OF YOUR VERSION
Thanks to my Best buddy for testing the shaderpack and suggestions
(ill link his account once he makes one)
i myself 
tested it in 1.12.2 , works with optifine