Installing a Forge, NeoForge or Fabric modpack
Align loader, Minecraft and Java, then import the modpack server files.
A modpack generally imposes a precise version of Minecraft, the loader and Java. Always use the server pack provided by its publisher.
Step-by-step procedure
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Read the prerequisites
Note the Minecraft version, the loader, Java and the recommended RAM on the official modpack page.
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Choose the right egg
Use Forge, NeoForge or Fabric depending on the package, then select the requested version.
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Download the server pack
Do not upload the client archive directly. The server pack excludes visual-only mods and contains the server configurations.
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Import and extract
Stop the server, import the archive into Files then unzip it to the root.
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Start and diagnose
Follow the console. A mixin, dependency, or Java error almost always indicates a version mismatch.