Download Insanity Shaders Here -

Once the game loads, click on -> Video Settings -> Shader Packs . Click the button that says Open Shader Pack Folder .

: If you are using Iris, double-click the downloaded Iris .jar installer, choose your desired Minecraft version, and click install. Download Insanity Shaders Here

To quickly toggle your shaders on and off in-game, you can simply press the key. Once the game loads, click on -> Video

Before you can run the shader, you will need a shader loader installed for your Minecraft Java Edition: Once the game loads

(Highly Recommended): The creator of Insanity Shaders explicitly recommends using Iris. You can grab the universal installer directly from the Iris Shaders Official Site.