ImmersiveEngineering-1.15.2-4.1.1-125 is a release file of the Minecraft mod Immersive Engineering for Forge, made for Minecraft 1.15.2. It was published on November 1, 2020 and is 8.6 MB in size. For the full description, screenshots and every other version, visit the Immersive Engineering mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.