Menu

mod

Prevent Crappy LauncherMinecraft mod for 1.21.6

A LaunchWrapper/ModLauncher CoreMod to prevent players from launching the game via a crappy launcher.

client onlynewest supported 1.21.6Utility
Latest version
2.1-retro
Minecraft
1.6.4 to 1.21.6
Java
Java 21+
Loaders
NeoForge, Forge
Licence
MPL-2.0
Downloads
45.5k
Updated
13 mo ago
Available on
Modrinth
Space NodePartner

Host Prevent Crappy Launcher servers

One click and Prevent Crappy Launcher is installed with the right loader, on hardware built for it.

  • 1.21.6
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Prevent Crappy Launcher declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.6NeoForge, Forge21+declared17 Jun 2025
1.21.5NeoForge, Forge21+declared25 Mar 2025
1.21.4Forge, NeoForge21+declared3 Dec 2024
1.21.3NeoForge, Forge21+declared23 Oct 2024
1.21.2NeoForge, Forge21+declared22 Oct 2024
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.21NeoForge, Forge21+declared13 Jun 2024
1.20.6NeoForge, Forge21+declared29 Apr 2024
1.20.5NeoForge, Forge21+declared23 Apr 2024
1.20.4NeoForge, Forge17+declared7 Dec 2023
1.20.3NeoForge, Forge17+declared4 Dec 2023
1.20.2NeoForge, Forge17+declared20 Sept 2023
1.20.1NeoForge, Forge17+declared12 Jun 2023
1.20NeoForge, Forge17+declared2 Jun 2023
1.19.4NeoForge, Forge17+declared14 Mar 2023
1.19.3NeoForge, Forge17+declared7 Dec 2022
1.19.2NeoForge, Forge17+declared5 Aug 2022
1.19.1NeoForge, Forge17+declared27 Jul 2022
1.19Forge, NeoForge17+declared7 Jun 2022
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.18.1NeoForge, Forge17+declared10 Dec 2021
1.18Forge, NeoForge17+declared30 Nov 2021
1.17.1NeoForge, Forge16+declared6 Jul 2021
1.17NeoForge, Forge16+declared8 Jun 2021
1.16.5NeoForge, Forge8+declared14 Jan 2021
1.16.4NeoForge, Forge8+declared29 Oct 2020
1.16.3NeoForge, Forge8+declared10 Sept 2020
1.16.2NeoForge, Forge8+declared11 Aug 2020
1.16.1NeoForge, Forge8+declared24 Jun 2020
1.16NeoForge, Forge8+declared23 Jun 2020
1.15.2NeoForge, Forge8+declared17 Jan 2020
1.15.1NeoForge, Forge8+declared16 Dec 2019
1.15NeoForge, Forge8+declared9 Dec 2019
1.14.4NeoForge, Forge8+declared19 Jul 2019
1.14.3NeoForge, Forge8+declared24 Jun 2019
1.14.2NeoForge, Forge8+declared27 May 2019
1.14.1NeoForge, Forge8+declared13 May 2019
1.14NeoForge, Forge8+declared23 Apr 2019
1.13.2NeoForge, Forge8+declared22 Oct 2018
1.13.1NeoForge, Forge8+declared22 Aug 2018

37 older versions not shown.

Download

From Prevent Crappy Launcher’s own host. Nothing is re-hosted here.

2.1-retrorelease29 Jun 2025

PreventCrappyLauncher-2.1-retro.jar · 0.0 MB · for 1.6.4, 1.7.2, 1.7.3, 1.7.4

Download latest
13b439b6b47b…
Older versions2
  • 2.0-retro2 Sept 20221.6.4, 1.7, 1.7.1, 1.7.2, 1.7.344.3k downloads
  • 2.0-modern2 Sept 20221.13, 1.13.1, 1.13.2, 1.14, 1.14.1599 downloads

Frequently asked

Does Prevent Crappy Launcher work on Minecraft 1.21.6?

Yes. 1.21.6 is the newest Minecraft version Prevent Crappy Launcher declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Prevent Crappy Launcher support?

Everything the author has declared, from 1.6.4 up to 1.21.6. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Prevent Crappy Launcher on the client or the server?

The client only. There is nothing to install on the server, so it works on any server you can already join.

Which loader does Prevent Crappy Launcher need?

NeoForge, Forge. A build for one loader will not load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Prevent Crappy Launcher?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

What licence is Prevent Crappy Launcher under?

MPL-2.0, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Prevent Crappy Launcher?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Prevent Crappy Launcher safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Entity CullingUsing async path-tracing to hide Block-/Entities that are not visibleFerriteCoreMemory usage optimizationsImmediatelyFastSpeed up immediate mode rendering in MinecraftYetAnotherConfigLib (YACL)A builder-based configuration library for Minecraft!Xaero's MinimapDisplays a map of the nearby world terrain, players, mobs, entities in the corner of your screen. Lets you create waypoints which help you find the locations you've marked.[ETF] Entity Texture FeaturesEmissive, Random & Custom texture support for entities in resourcepacks just like Optifine but for Fabric

Last checked 6 d ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .