How do I install Aeronautics: Dupe fix?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Aeronautics: Dupe fix work with?

The listing gives Minecraft 1.21.1. This is the version stated by the author or source site, not something we verified ourselves.

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Aeronautics: Dupe fix

Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.

by F_ery_a · on Modrinth

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Aeronautics DupeFix

Aeronautics DupeFix is a lightweight bug-fix and compatibility mod for Minecraft 1.21.1 NeoForge.

It fixes an item duplication issue involving Create and Create: Aeronautics.

Demonstration

Without Aeronautics DupeFix

The duplication issue can be reproduced without the mod installed.

With Aeronautics DupeFix

After installing Aeronautics DupeFix, the duplication issue no longer occurs.

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft version listed: 1.21.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Ships as dupefix-1.21.1-1.3.0.jar — drop this file into the mods folder
Download size: 3 KB
Download link checked 5 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

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All Mods for Java All Minecraft Java mods Java mods for 1.21