improve_2000_2.2.1_1.20.1.jar is a release file of the Minecraft mod [Immersive Vehicles/IV/MTS VEB/IAV]"Improved -2000" for Forge, made for Minecraft 1.20.1. It was published on January 27, 2026 and is 37.8 MB in size. For the full description, screenshots and every other version, visit the [Immersive Vehicles/IV/MTS VEB/IAV]"Improved -2000" mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.