If you have downloaded a INF driver file that doesn't have an installer package, you can manually install it using the .inf file. Here's how.

How to install and run OptiFine in 'Minecraft' without mods 1. In a web browser of your choice, navigate to the OptiFine downloads page.

Steps to download and install Minecraft 1.21.5 Shaders Before you install the shaders, you will need the mod that enables the shader support. The 2 popular choices include Iris Shaders and OptiFine.