NOTE MultiMC is a modding-friendly alternate launcher for Minecraft, which is recommended for working with Fabric and can be found here. If you don't wish to use MultiMC or don't know or care what launcher you're using, follow through to the regular client instructions.

1. Create a new game instance.
2. Select “Edit Instance” in the instance context menu or on the right side of the window.
3. On the Version tab of the configuration window, click “Install Fabric” to bring up a dialog with all the available Fabric Loader versions. Pick one and click OK to add it to the instance.
   • Generally using the latest available Loader version is recommended.
   • The loader should be mostly game version-independent. If this situation changes, it will be pointed out, so don't worry!
4. Press OK. Your Fabric instance is ready to go - feel free to add mods to it!

For more detailed instructions visit this guide: Installing Fabric using the MultiMC launcher

1. Download the Fabric installer from the download page.
   • You can download the installer directly from modmuss50's Jenkins as well.
2. Open the installer. In the window you need to configure the mapping and loader version (as per advice in the MultiMC section) and the install location (the default should be fine on most platforms).
   NOTE You need to enable snapshots in order to make the installer show mapping options for Minecraft snapshots.
3. Press Install. A new game version and profile will be created in the launcher's menu, which you can now use to launch Fabric.

For more detailed instructions visit this guide: Install using the Minecraft Launcher

NOTE Up-to-date as of Loader 0.4.4+. Older versions choose different techniques. Installer 0.4.0+ required!

1. Download the Fabric installer from the download page.
   • You can download the installer directly from modmuss50's Jenkins as well.
2. Open the installer. Select the “Server” tab at the top of the window.
3. In the window you need to configure the mapping and loader version and the install location.
   NOTE You need to enable snapshots in order to make the installer show mapping options for Minecraft snapshots.
4. Press Install. In the output directory, a fabric-server-launch.jar will be created. It expects a server.jar, which is the vanilla server JAR, generally found on Mojang's version announcement blog posts, next to it, but will also generate a properties file on first launch where you can change the path.
   NOTE If you are upgrading your existing server, remember to remove the .fabric folder if the installer did not remove that for you! Or you will get classloading errors.

For more detailed instructions visit this guide: Installing a Minecraft/Fabric Server

The fabric installer has full support from installing the client and the server from the command line. This could be used to automate the installation. The installer has a number of commands that can be used for a headless install.

• -snapshot Enables the usage of snapshot versions of Minecraft.
• -dir Used to select the installation dir, defaults to the current working directory.
• -mcversion Used to select the minecraft version, defaults to the latest stable version.
• -loader Used to select the loader version, defaults to the latest.
• -downloadMinecraft Used to automatically download the Minecraft server jar
• -noprofile Skip creating client profile
• -mavenurl (advanced) Use a custom maven url when installing
• -metaurl (advanced) Use a custom meta server url

• help Prints out all of the commands available along with the latest mappings and loader versions. Ignores options. Example:

  java -jar fabric-installer.jar help

• server Used to create the required files for a Fabric server. Accepts all options, none are required. Example:

  java -jar fabric-installer.jar server

• client Used to create the required files for a Fabric client. Accepts all options, -dir is required. Example:

  java -jar fabric-installer.jar client -dir "~/Games/.minecraft"