Minecraft Launcher

Installer (recommended)

Windows

1. Download the FO Installer

2. Open the exe installer. If you get a security prompt from Windows, allow the installer to run:

   • Click on More info

   • Click on Run anyway

   • Why did I get this prompt?

3. Select your desired FO and Minecraft versions

4. Click on Install

5. Open the Minecraft Launcher. You should find a new installation

6. Launch the newly created installation. Minecraft should start up

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

Why does Windows show the security prompt?

Linux

1. Download the FO Installer

2. Open the appimage installer. If you get a security prompt from your OS, click on Run once.

3. Select your desired FO and Minecraft versions

4. Click on Install

5. Open the Minecraft Launcher. You should find a new installation

6. Launch the newly created installation. Minecraft should start up

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

macOS 15 Sequoia or later

1. Download the FO Installer
2. Open the dmg installer. If you get a security prompt from macOS, allow the installer to run:

   • Double-click on the FO Installer. You will get a warning

   • Click on Done

   • On the menu bar, click on the Apple logo

   • Click on System Settings

   • In the sidebar, click on Privacy & Security

   • In the right view, scroll down to find a Open anyway button

   • Click the Open anyway button

   • If prompted, authenticate with your password or your fingerprint

   • Why did I get this prompt?
3. Select your desired FO and Minecraft versions

4. Click on Install

5. Open the Minecraft Launcher. You should find a new installation
6. Launch the newly created installation. Minecraft should start up

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

Why does macOS show the security prompt?

Apple has implemented a verification system for programs, which costs 99 USD a year. Such an expense is not worth it for FO.

If you are concerned by this, you can also install FO manually, or use another launcher compatible with FO. By the way, FO's installer's source code is available if you want to check it.

macOS 14 Sonoma or older

1. Download the FO Installer
2. Open the dmg installer. If you get a security prompt from macOS, allow the installer to run:

   • Right-click on the FO Installer

   • Click on Open

   • If a popup prompts again, click on Open

   • Why did I get this prompt?
3. Select your desired FO and Minecraft versions

4. Click on Install

5. Open the Minecraft Launcher. You should find a new installation
6. Launch the newly created installation. Minecraft should start up

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

Why does macOS show the security prompt?

Apple has implemented a verification system for programs, which costs 99 USD a year. Such an expense is not worth it for FO.

If you are concerned by this, you can also install FO manually, or use another launcher compatible with FO. By the way, FO's installer's source code is available if you want to check it.

If the installation with the installer fails, or you want a version older than 5.10.3, you should install FO manually.

Please report any issues you encounter on GitHub or on Discord.

Manual

Minecraft 1.19.4 and above

1. On macOS and Linux, download and install Java

2. Download the Fabric Installer

3. Open the Fabric Installer

4. Select version 0.16.12 of the Fabric Loader

5. Click on Install. You have now installed the Fabric Loader

6. Open the Minecraft Launcher

7. Click on Installations. You should find a new Fabric installation

8. Click on the folder icon 📂 next to the Fabric installation

9. Open your browser

10. Open the FO vanilla downloader

11. If you do not want the latest version of FO, select the version you want from the dropdown

12. Click on the download button ⬇️. A zip file should be downloaded. What does the zip file contain?

13. If you get a prompt about popup windows or multiple downloads, please allow them

14. Extract the zip file

15. Open the extracted zip file

16. Copy all folders from the extracted zip file to the .minecraft folder you opened in step 8. Why do I need to copy everything over?

17. If you're asked to replace files, replace them

18. If you want the recommended FO settings, delete options.txt. This will reset your vanilla options (resource packs, language, keybinds...) but you can reapply them later

19. Go back to the Minecraft Launcher

20. Launch the Fabric installation from step 7. Minecraft should start up

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

What does the zip file contain?

The zip file contains the following:

• config/: Configuration files to adjust the mods for the best experience

• mods/: The mods included in FO

• resourcepacks/: Small resource packs for the best experience. What do the resource packs do?
• Copy all 3 folders!: A dummy file reminding you to, well, copy all 3 folders!

Minecraft 1.16.1 - 1.19.3

1. Install the appropriate version of Java:

   • Minecraft 1.19-1.19.3: Java 17
   • Minecraft 1.17-1.18.2: Java 17
   • Minecraft 1.16.5: Java 8
2. Download the Fabric Installer
3. Open the Fabric Installer

4. Select the appropriate version of the Fabric Loader:

   • Minecraft 1.19-1.19.3: version 0.14.24

   • Minecraft 1.17-1.18.2: version 0.14.12

   • Minecraft 1.16.5: version 0.13.3

5. Click on Install. You have now installed the Fabric Loader

6. Open the Minecraft Launcher
7. Click on Installations. You should find a new Fabric installation

8. Click on the folder icon 📂 next to the Fabric installation

9. In your browser, open the Files section on CurseForge
10. Click on the appropriate version of FO

11. Click on Additional files. You should find a MultiMC version

12. Click on ⋮, then on Download file. A zip file should be downloaded. What does the zip file contain?
13. Extract the zip file. If you see less than 10 mods in it, you have downloaded the wrong version

14. Go to Fabulously Optimized x.x.x > minecraft. You should find a zip file in there

15. Extract the zip file

16. Copy all folders from the zip's minecraft folder to the .minecraft folder you opened in step 6. Why do I need to copy everything over?
17. If you're asked to replace files, replace them

18. If you want the recommended FO settings, delete options.txt. This will reset your vanilla options (resource packs, language, keybinds...) but you can reapply them later
19. Go back to the Minecraft Launcher

20. Launch the Fabric installation from step 5. Minecraft should start up

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

What does the MultiMC pack contain?

The MultiMC zip file is a packaged instance for MultiMC, but it was also used for manual installation up to FO 6.0.0. This file was hosted on CurseForge because downloads from there used to support FO with monetary benefits.

It contains the following:

• Fabulously Optimized x.y.z/: A folder containing the MultiMC instance

  • minecraft/: The main folder of FO

    • config/: Configuration files to adjust the mods for the best experience

    • mods/: The mods included in FO

    • resourcepacks/: Small resource packs for the best experience. What do the resource packs do?
    • Copy all 3 folders!: A dummy file reminding you to, well, copy all 3 folders!

  • instance.cfg: A manifest file describing name, icon, type and notes for the instance

  • mmc-pack.json: A manifest file describing the version of Minecraft, Fabric and of other dependencies

  • pack.png: An icon for the instance

Why do I need to copy everything over?

FO consists of mods, configuration and resource packs, and all three are necessary. What does the pack contain?

Copying the mods folder alone may result in a number of issues:

• In some versions the game will not launch at all

• Some of your resource packs will be broken

• Some features, such as zoom, will not work as shown

• New unexpected keybinds will appear

• Confusing mod buttons or popups will appear

• Confusing descriptions in the mod list

• There won't be any FO version number in the title screen

If you have mistakenly forgotten to copy the other folders, do the following:

1. Follow steps 6-8 from the instructions above to open the installation's folder

2. Locate and delete the mods folder

3. If you had modified your settings in-game, move both config/ and options.txt to a different location

4. Follow steps 9-17 from the instructions above to copy the missing files over

5. If you had backed up your settings in step 3 and you don't want the recommended FO settings, move yours back
6. Follow steps 19-21 from the instructions above to complete the installation