Optifine: https://www.optifine.net/home
Installing Optifine: https://www.youtube.com/watch?v=b10o6DYQLOM (whatever magic installer the forums said was terrible and did not work
Shader Used, Seus: https://www.sonicether.com/seus/ Downloaded from here but maybe there is something newer?: https://www.patreon.com/posts/45141775 (see towards bottom of the page)