To Install Download Reshade from: https://reshade.me/

Once you open the setup select sekiro from directory (game directory) and select sekiro.exe
afterwards it's your choice if you want to select the preset from the setup or manually select it once you've installed (selecting from setup is recommended) just extract it to desktop and select in the setup. (Select DirectX10/11/12 as rendering mode) afterwards it'll ask you what shaders to download just click on uncheck all then check all and install once it finishes installing all the shaders click on finish and open sekiro and you'll have shaders.