LegacyCompatibilityUtils
(CompatLib in short) Made most 1.7.2 Forge mods working on 1.7.10, and some 1.8 Forge and LiteLoader mods on 1.8.9.
This is done by re-add removed classes and srg methods/fields.
Exceptions:
- Coremods with
@MCVersion("x.x"). - Mods that uses obfuscated ("Notch") codes like reflection helper or ASM.
1.7.10:
- The Mod was using 1.7.2's player skin related codes.
- See diff.yml for other changes.
1.8.9:
- The Mod was using some 1.8's Forge Registry API related codes.
- See diff.yml for other changes.
1.7.10 version Requires UniMixins, and 1.8.9 Requires MixinBooter 9.4
This mod contains following libs:
A Relocated https://github.com/FabricCompatibilityLayers/CursedMixinExtensions
(See GitHub for More)
Notice
If anyone is interested at making another runtime deobf remapper or remap mixins to support some other things, feel free to open a topic in Github Discussion.
Submit an issue on GitHub if you met incompatibilities. 1.7.10 on the right and 1.8.9 Issue Here.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.8.9
- 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.
- Ships as CompatLib-1.8.9.jar — drop this file into the mods folder
- Download size: 951 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.