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How to install "The Lost Castle"

Former structure of End Remastered, The Lost Castle introduces an enormous castle. Inside resides infinite fortune and mysteries from a long forgotten civilization that disappeared a long time ago...

Author

jack-bagel

Downloads

4.8M

Last Updated

May 10, 2026

License

LGPL-3.0-only

Mod Loaders

Fabric Forge NeoForge

Minecraft Versions

26.1.2 1.21.5 1.20.6 1.19.4 1.18.2
adventure worldgen

Quick Install ID

#the-lost-castle

Install The Lost Castle in GDLauncher

The Lost Castle runs on Fabric, Forge, NeoForge. Pick whichever your existing instance uses, or create a new one. GDLauncher installs the correct loader automatically.

Install on Fabric

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Fabric loader and a Minecraft version that The Lost Castle supports (26.1.2, 1.21.5, 1.20.6 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #the-lost-castle, find The Lost Castle in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Install on Forge

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Forge loader and a Minecraft version that The Lost Castle supports (26.1.2, 1.21.5, 1.20.6 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #the-lost-castle, find The Lost Castle in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Install on NeoForge

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the NeoForge loader and a Minecraft version that The Lost Castle supports (26.1.2, 1.21.5, 1.20.6 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #the-lost-castle, find The Lost Castle in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Before you install

Make sure your Minecraft version matches what The Lost Castle supports. As of the latest release, 26.1.2, 1.21.5, 1.20.6 are supported. The Lost Castle supports multiple loaders (Fabric, Forge, NeoForge); pick whichever matches your other mods. GDLauncher checks compatibility for you and won't install something incompatible with the instance you've chosen.

Frequently Asked Questions

Is The Lost Castle free?

Yes. The Lost Castle is free to download and install through GDLauncher. GDLauncher itself is also free and ad-free.

What Minecraft versions does The Lost Castle support?

The Lost Castle supports Minecraft 26.1.2, 1.21.5, 1.20.6, 1.19.4, 1.18.2. GDLauncher will automatically pick a compatible version when you install it.

Does The Lost Castle require Forge or Fabric?

The Lost Castle supports Fabric, Forge, NeoForge. Pick the loader that matches your other mods, or let GDLauncher set up a fresh instance for you.

How do I install The Lost Castle?

Open GDLauncher, go to your instance's Addons tab, click Add Addons, and paste the Quick Install ID #the-lost-castle. GDLauncher handles dependencies and the right Minecraft version automatically.

Who made The Lost Castle?

The Lost Castle is made by jack-bagel. The full project lives on Modrinth (https://modrinth.com/mod/the-lost-castle).

Need help?

Read our troubleshooting guide, check the guides section, or join the GDLauncher Discord community.

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