x4ui-r1.0b4.jar is a beta file of the Minecraft mod x4ui for Forge, made for Minecraft 1.12.2. It was published on September 4, 2026 and is 2.1 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 x4ui mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
