If you truly need duplication capabilities in single-player or a private server, learn how to use commands, datapacks, or inspect open-source Fabric mods on GitHub where you can review the code yourself. Never trust a file by its enticing name alone.
At its core, this file is a designed for Minecraft Java Edition 1.20.1 . Unlike traditional utility mods (like JEI or MiniHUD) that help with gameplay or visuals, this mod is classified as a exploit utility or a cheat client module . File name- Dupe-Trigger-Mod-Fabric-1.20.1.jar