Legacy4J [Neoforge] 1.21.5-1.9-pre-3-lts is a beta file of the Minecraft mod Legacy4J for NeoForge, made for Minecraft 1.21.5. It was published on August 19, 2026 and is 24.6 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Legacy4J mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
