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Mods/Installing OptiForge/Manual Install/Modify Existing

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This guide will help you install the latest version of Minecraft Forge and OptiFine.

This guide assumes you have already chosen a Minecraft version you would like to modify, and already know how to access it on your file system. If you need help with that, check out the guide on the previous page.

Step 1. Download & Install Forge[edit]

  1. Choose and download a Forge version to use. You can find a list of downloads on their download site. Be sure to check if the Forge version is compatible with the version of Minecraft that you are using. Download the "Universal" .jar file. On their download site, the compatible Minecraft version is listed in the "Minecraft Version" column. The Forge version is in the format of <major>.<minor>.<micro>.<build>. For this guide we will be using the Forge version 14.22.0.2452 for Minecraft 1.12.1, as it's the latest version at the time of writing. Remember what version of Forge you downloaded, you will need it in the following steps. You can download the Universal file from either site, or construct the URL manually. The file is located at http://files.minecraftforge.net/maven/net/minecraftforge/forge/<minecraft_version>-<forge_version>/forge-<minecraft_version>-<forge_version>-universal.jar where <minecraft_version> is your chosen Minecraft version, and <forge_version> is your chosen Forge version. For Minecraft 1.12.1 and Forge 14.22.0.2452 this would be on
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    http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.12.1-14.22.0.2452/forge-1.12.1-14.22.0.2452-universal.jar.
  2. Forge will come as a .jar file. Move and rename this file to
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    libraries/net/minecraftforge/forge/<minecraft_version>-<forge_version>/forge-<minecraft_version>-<forge_version>.jar
    in your .minecraft directory, where <minecraft_version> is your chosen Minecraft version, and <forge_version> is your chosen Forge version. In this case it will be

    Move arrows.svg
    This page will soon be moved to ftb:Mods/Installing OptiForge/Manual Install/Modify Existing/mcforge-lib. [discuss]
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    This page should be exported to the above page, not moved via copying and pasting the page's contents. This action must be done by an administrator on the other wiki.
    libraries/net/minecraftforge/forge/1.12.1-14.22.0.2452/forge-1.12.1-14.22.0.2452.jar
    . You will need to create this directory.
    Linux
    n=minecraftforge; v=14.22.0.2452; d="$HOME/.minecraft/libraries/net/$n/forge/1.12.1-$v"
    mkdir -p "$d" && wget -cO "$d/forge-1.12.1-$v.jar" "http://files.$n.net/maven/net/$n/forge/1.12.1-$v/forge-1.12.1-$v-universal.jar"

Step 2. Download & Install OptiFine[edit]

  1. Choose and download an OptiFine version to use. You can find a list of downloads here.
  2. OptiFine will come as a .jar file. Move and rename this file to
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    libraries/optifine/optifine/<minecraft_version>-<optifine_version>/optifine-<minecraft_version>-<optifine_version>.jar
    in your .minecraft directory. The OptiFine version should have its spaces replaced with underscores. For 1.12.1 HD U C5 this will be
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    libraries/optifine/optifine/<minecraft_version>-<optifine_version>/optifine-<minecraft_version>-<optifine_version>.jar
    . You will need to create this directory.
    Linux
    n=optifine; v=1.6.2_HD_U_B3; d="$HOME/.minecraft/libraries/net/$n/$n/$v"
    mkdir -p "$d" && wget -cO "$d/$n-$v.jar" "http://$n.net/download.php?f=OptiFine_$v.zip"

Step 3. Tell Forge Mod Loader to Ignore Binary Discrepancies[edit]