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Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadMinecraft mod for 1.21.1

Brutal, gruesome, and challenging. An outbreak of failed bioweapons invades your world. Currently Added: Killing Floor

newest supported release 1.21.1Adventure RpgCosmeticMc AddonsWorld Mobs
Latest version
outbreak_kf-1.1.0-neoforge-1.21.1.jar
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
not stated
Downloads
102.0k
Updated
4 mo ago
Available on
CurseForge

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.20.1NeoForge, Forge17+declared12 Jun 2023

Download

From Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead’s own host. Nothing is re-hosted here.

Browse 30 indexed releases

Most recently published release

outbreak_kf-1.1.0-neoforge-1.21.1.jarrelease22 Jul 2026

outbreak_kf-1.1.0-neoforge-1.21.1.jar · 6.1 MB · for 1.21.1 · NeoForge

Download this release
603043a11428…
Older versions24
  • outbreak_kf-1.1.0-forge-1.20.1.jar22 Jul 20261.20.16.1 MBba76ef6c6319…Get
  • outbreak_kf-1.0.4-forge-1.20.1.jar30 Apr 20261.20.15.8 MB1 download0ce5bcf88f55…Get
  • outbreak_kf-1.0.4-neoforge-1.21.1.jar30 Apr 20261.21.15.8 MB1 downloadf4122472dfa7…Get
  • outbreak_kf-1.0.3.2-neoforge-1.21.1.jar27 Feb 20261.21.15.7 MB1.4k downloadsc1b3a7e291b6…Get
  • outbreak_kf-1.0.3.2-forge-1.20.1.jar27 Feb 20261.20.15.8 MB369 downloadsc50dfbc60fa4…Get
  • outbreak_kf-1.0.3.1-hotfix-neoforge-1.21.1.jar9 Feb 20261.21.15.7 MB481 downloads3bc148c539d6…Get
  • outbreak_kf-1.0.3.1-hotfix-forge-1.20.1.jar9 Feb 20261.20.15.8 MB8fcf5c21a87b…Get
  • outbreak_kf-1.0.3-neoforge-1.21.1.jar8 Feb 20261.21.15.7 MB46 downloads62ac10bd115e…Get
  • outbreak_kf-1.0.3-forge-1.20.1.jar8 Feb 20261.20.15.8 MB2dc2f1845087…Get
  • outbreak_kf-1.0.2.2-forge-1.20.1.jar21 Jan 20261.20.15.6 MB150 downloads1f198b06855b…Get
  • outbreak_kf-1.0.2.2-neoforge-1.21.1.jar21 Jan 20261.21.15.6 MB94a278ab881e…Get
  • outbreak_kf-1.0.2.1-forge-1.20.1.jar8 Jan 20261.20.15.6 MB93 downloads1353737d90dd…Get
  • outbreak_kf-1.0.2.1-neoforge-1.21.1.jar8 Jan 20261.21.15.5 MB618336d02d06…Get
  • outbreak_kf-1.0.2-neoforge-1.21.1.jar4 Jan 20261.21.15.5 MB19 downloadse012fe8a3c42…Get
  • outbreak_kf-1.0.2-forge-1.20.1.jar4 Jan 20261.20.15.6 MB6c617c2c63f6…Get
  • outbreak_kf-1.0.1-neoforge-1.21.1.jar20 Dec 20251.21.15.5 MB29 downloadsd533313f4801…Get
  • outbreak_kf-1.0.1-forge-1.20.1.jar20 Dec 20251.20.15.5 MBf53be0e2c485…Get
  • outbreak_kf-1.0.0-neoforge-1.21.1.jar17 Dec 20251.21.15.0 MB23 downloadsc97f4da25198…Get
  • outbreak_kf-1.0.0-forge-1.20.1.jar17 Dec 20251.20.15.0 MBed00bc454bc9…Get
  • outbreak_kf-0.9.9-neoforge-1.21.1.jar9 Dec 20251.21.14.4 MB89 downloadsf21594e08f5e…Get
  • outbreak_kf-0.9.9-forge-1.20.1.jar9 Dec 20251.20.14.4 MB2 downloads5febca278b77…Get
  • outbreak_kf-0.9.8-forge-1.20.1.jar7 Dec 20251.20.13.3 MB124 downloads5b897f4cddef…Get
  • outbreak_kf-0.9.7-forge-1.20.1.jar4 Dec 20251.20.13.2 MB106 downloads6c59d4d91144…Get
  • outbreak_kf-0.9.6-forge-1.20.1.jar3 Dec 20251.20.12.8 MB35 downloadsa181756a729d…Get

Frequently asked

Does Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead 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 Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead support?

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

Which Java version do I need for Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead?

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 Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

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

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Details from CurseForge, where the author last updated it on 22 Jul 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .