How to install OptiFine in MultiMC (works with 1.20.1)

OptiFine in MultiMC.md

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.

1. Download OptiFine for your version

2. Double-click and run using Java (you may need to install a version of Java)

3. Select "Extract OptiFine"

   • This will put the extracted file of OptiFine in your Downloads folder.

   • Newer versions of Minecraft will require some finagling. Click to reveal these steps.

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     "Patching" your OptiFine file:

     1. Right click and "Rename" the OptiFine_1.XX.XX_??_?_?_MOD.jar to be .zip instead.
     2. Extract the zip file.
     3. Enter the new folder and find the folder named notch.
     4. Select all files in this folder, right-click, and press "Cut."
     5. Go back to the main folder (with assets, doc, etc.), right-click, and click "Paste."
     6. Delete the notch folder.
     7. Go back to your Downloads folder and right click the OptiFine folder. Choose "Send to" -> "Compressed (zipped) folder."
     8. Finally, once the new zip file has been created, rename it to a .jar file. This is your new "patched" OptiFine file.

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4. Navigate to the MultiMC instance you wish to install OptiFine into (such as C:\mc\MultiMC\instances\<instance>\.minecraft\)

   • If you are having troubles finding your MultiMC instance directory, enter the MultiMC app, select your instance, and click "Instance Folder" in the sidebar.

5. Move your OptiFine file (the extracted one or the "patched" one) to your instance's libraries folder (create one if it does not exist)

   • Example directory: C:\mc\MultiMC\instances\<instance>\libraries\OptiFine_(PATCHED).jar

6. In MultiMC, choose "Edit Instance," go to the "Version" screen, and select the Minecraft entry in the list. Then click "Add to Minecraft.jar."

7. Select the OptiFine file you added in Step 5.