It will start downloading the latest version, in this case, 1.19.3. If not, choose version 1.19.3, press “Play”. You will see a dropdown menu in the lower-left corner that says “Latest Release”, check if it says 1.19.3. You will mostly need OptiFine does all the magic behind the codes the second requirement is the Shader Packs themselves. The Shaders function doesn’t come by default in Minecraft Java Edition, which requires the external installation and download processes, but the whole process is quite simple.
