outbreak_kf-1.0.0-forge-1.20.1.jar is a release file of the Minecraft mod Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead for Forge, made for Minecraft 1.20.1. It was published on December 17, 2025 and is 5 MB in size. For the full description, screenshots and every other version, visit the Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.