Insanity Shaders Here: Download
(Highly Recommended): The creator of Insanity Shaders explicitly recommends using Iris. You can grab the universal installer directly from the Iris Shaders Official Site.
Before you can run the shader, you will need a shader loader installed for your Minecraft Java Edition: Download Insanity Shaders Here
To bring up the shader settings menu instantly, press the key. If you would like to customize the look, let me know: you can simply press the key.
To quickly toggle your shaders on and off in-game, you can simply press the key. Download Insanity Shaders Here