Open Minecraft launcher and select the newly created Optifine or Iris profile.– we recommend Iris, it’s a bit more optimized Download and install Optifine or Iris.– in the top menu, select the “Installations” tab, click “New installation”, under the “Version” dropdown, select your preferred Minecraft version and click “Create”. Open Minecraft launcher and setup your game profile for the Minecraft version you want to run.
