ycsm1.15.03.jar is a release file of the Minecraft mod You Can't See Me! [Forge] for Forge, made for Minecraft 1.15-Snapshot, 1.15, 1.15.2, 1.15.1. It was published on August 5, 2021 and is 0.1 MB in size. For the full description, screenshots and every other version, visit the You Can't See Me! [Forge] mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.