Install

Other launchers

Install LeiCraftClient with ATLauncher, or with any other launcher that can create a Fabric 26.3 instance.

LeiCraftClient works with every launcher that can start Minecraft 26.3 with Fabric and has a mods folder. This page covers ATLauncher step by step, and then the general recipe for any other launcher.

What you need

  • A launcher that can create a Fabric instance for Minecraft 26.3.
  • The LeiCraftClient jar from the download page or Modrinth.
  • Fabric API for 26.3 from Modrinth.
  • Fabric Language Kotlin 1.14.2 or newer from Modrinth.

ATLauncher

Create the instance

  1. Open the Create Pack tab.
  2. Instance Name: anything you like.
  3. Minecraft Version: 26.3.
  4. Loader: Fabric.
  5. Loader Version: the newest one is fine (0.19.5 or newer).
  6. Click Create Instance.

Add the mods from Modrinth

On the new instance's card, click Add Mods. Choose Modrinth as the source and search for each mod, then install it:

  • LeiCraftClient
  • Fabric API
  • Fabric Language Kotlin

Or add the jar from our website

If you downloaded the LeiCraftClient jar from the download page, click Edit Mods on the instance's card, then Add Mod. Choose the jar and pick Mod as the type. Add Fabric API and Fabric Language Kotlin with Add Mods as above.

Start the game

Start the instance. Look for the LeiCraftClient button on the title screen, below the Realms button. If you see it, LeiCraftClient is installed.

Any other launcher

Launcher menus differ, but the recipe is always the same:

Create a Fabric 26.3 instance

Create a new instance or profile with Minecraft 26.3 and Fabric Loader 0.19.5 or newer. If your launcher can't create Fabric instances, use the Fabric installer with the official Minecraft Launcher, or one of the launchers from the quick start instead.

Find the mods folder

Open the instance's folder. Most launchers have a button like "Open folder" for this. Inside is a folder called mods. If it's missing, start the instance once, or create the folder yourself.

Add the three mods

Copy the LeiCraftClient jar, Fabric API and Fabric Language Kotlin into the mods folder. Don't unzip them.

If your launcher has its own mod browser, you can use it for Fabric API and Fabric Language Kotlin. Make sure it gives you the versions for 26.3 and Fabric.

Start the game

Start the instance. Look for the LeiCraftClient button on the title screen, below the Realms button. If you see it, LeiCraftClient is installed.

Your launcher must sign in with a real (premium) Minecraft account if you want to wear capes. With an offline or cracked account you still see everyone's capes and cosmetics, but you can't link an account. See Link your account.

You can already see other players' capes and cosmetics. To wear your own, link your Minecraft account: Link your account.

Troubleshooting

  • The game stops with an error about missing or incompatible mods. The error names the missing mod. Most often it is Fabric Language Kotlin or Fabric API. Add the version for 26.3 to the mods folder.
  • There is no LeiCraftClient button. Check that the instance runs Fabric on 26.3, and that the jar is in this instance's mods folder, not in another one.

More help: Troubleshooting.