ProjectRed-1.12.2-4.9.0.83-Base.jar is a release file of the Minecraft mod Project Red - Core, made for Minecraft 1.12.2. It was published on May 29, 2018 and is 1.9 MB in size. For the full description, screenshots and every other version, visit the Project Red - Core mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
