- For MultiMC-based launchers: create a new instance using the version that you wish to use and make sure all resources needed are downloaded. Edit that instance and add the mod you want to install as a jarmod using the "Add to Minecraft.jar" feature. For inf-20100630, also install Manifold as a jarmod for inf-20100630 BigInteger by adding it the same way.
- For the official Minecraft Launcher (current version) and PojavLauncher: navigate to your .minecraft folder and open versions. Make sure you have already ran the version that the mod you want to install is based on. Make a copy of that folder in your versions directory and rename it and the files inside to something like `version-mod` where `version` is the Minecraft version base you are using and `mod` is the mod you are installing (ie: 64bit, BigInt, etc). Edit the json and delete everything between "client" and (but not including) "server". Then find where it says `"id": version` and change the version to what you named the files previously. Save everything and reopen your launcher. Please note, 1.3.2-BigInteger will likely not work on PojavLauncher without patching.
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