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MultiMC

MultiMC does not support automatic updates by default. However, FO has developed a custom MultiMC pack to perform updates automatically. Read more about the MultiMC auto-updating pack

While this variant allows for automatic updates within a specific Minecraft version, it is more difficult to update across Minecraft versions and to disable FO's mods.

Consider using Prism Launcher, which has a similar interface and a version manager.

  1. Download and install Java 21

  2. Download FO's MultiMC pack for your preferred Minecraft version from GitHub Releases:

    1.21.51.21.41.21.11.20.61.19.41.18.21.17.11.16.5

  3. If you do not want the latest version, you can find older ones in GitHub Releases

  4. Open MultiMC

  5. Drag the zip file and drop it inside of MultiMC's window. A window should pop up

  6. Click on OK in that window. Something should happen

  7. Double-click on that window. The download should start

  8. If you are asked to download a mod manually:

    1. Open the given address in your browser. The mod's page should open up

    2. Click on Cancel Launch

    3. Click on Download. A jar file should be downloaded

    4. Go back to MultiMC. You should find a new instance

    5. Click on the Fabulously Optimized instance

    6. Click on View Mods

    7. Drag the mod you downloaded in step 8.3 and drop it in the mod list

  9. Click on Launch. Minecraft should open up

  10. If you can see Fabulously Optimized in the bottom-right corner, you're done!

How Does It Work?

The MultiMC auto-updating pack launches packwiz every time it is opened. packwiz is a mod handling tool which will add and update any missing FO mods indicated in a pack.toml file.

Since the update checker runs on every launch, you'll get a skippable error if you play offline. The updater only manages FO's mods, not the mods added manually. The updater does not work across Minecraft versions, so you'll need to install it again every time.

MultiMC does not natively support automatic updates of packs: see issue #2640 and issue #3037. FO chose to use packwiz because it is also used for the vanilla installer.

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