The OptiFine installer requires that your target version of Minecraft be installed in the default launcher and has been opened at least once. Do this first.
- Download OptiFine for your version
- Double-click and run using Java (you may need to install a version of Java)
- Select "Extract OptiFine"
- This will put the extracted file of OptiFine in your Downloads folder.
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Newer versions of Minecraft will require some finagling. Click to reveal these steps.