Java Edition and mod loaders
For Java modding, verify the exact loader requirement and supported game version. A package for one loader is not automatically compatible with another.
Fabric-related searches
If you are specifically searching for Cataclysm mod Fabric support, require explicit documentation that the target package supports Fabric and note any dependencies.
Bedrock and Minecraft PE
Bedrock/PE uses addon formats and game systems that differ from Java mods. Do not place Java mod archives into a Bedrock addon workflow.
Terraria and other games
A Cataclysm-named project for Terraria or another game is a separate ecosystem. Use documentation for that game rather than reusing Minecraft instructions.
Practical next step
Return to the compatibility section to compare ecosystems, or review the Download section before opening the supplied archive.