ultracompression-0.5.0.jar is a release file of the Minecraft mod Ultra Compression Mod, made for Minecraft 1.7.10. It was published on July 21, 2014 and is 0.3 MB in size. For the full description, screenshots and every other version, visit the Ultra Compression Mod mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
