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This is a tutorial on how to run any mods or Minecraft versions if there is only the client.jar file but no .json file.

  •  <version>: The version main folder
    •  <version>.jar: The client.jar file. IT should be renamed to their version name respectively.
    •  <version>.json: The json file that you do not have currently
        •  id: The name of the <version>
        •  time: The time when this version was released
        •  type: The type of the version. Examples:old_alpha (Pre-classic, Classic, Indev, Infdev, and Alpha), old_beta (Beta), release (1.0), snapshot (Development versions)
        •  minecraftArguments: Authentication player name, authentication session, game directory, and game assets.
        •  libraries: Game libraries

Create a folder named <version>, the name should be the same with the <version>.jar file. Place your <version>.jar into that folder. Create a <version>.json in the same folder. The .json file should contain the following:

1.12.2.json
{
 "id": "1.12.2",
 "time": "Apr 18, 2013 23:17:30 PM",
 "type": "release",
 "minecraftArguments": "${auth_player_name} ${auth_session} --gameDir ${game_directory} --assetsDir ${game_assets}",
 "libraries": [
   {
     "name": "net.sf.jopt-simple:jopt-simple:4.4"
   },
   {
     "name": "com.paulscode:codecjorbis:20101023"
   },
   {
     "name": "com.paulscode:codecwav:20101023"
   },
   {
     "name": "com.paulscode:libraryjavasound:20101123"
   },
   {
     "name": "com.paulscode:librarylwjglopenal:20100824"
   },
   {
     "name": "com.paulscode:soundsystem:20120107"
   },
   {
     "name": "org.lwjgl.lwjgl:lwjgl:2.9.0"
   },
   {
     "name": "org.lwjgl.lwjgl:lwjgl_util:2.8.5"
   },
   {
     "name": "argo:argo:2.25_fixed"
   },
   {
     "name": "org.bouncycastle:bcprov-jdk15on:1.47"
   },
   {
     "name": "com.google.guava:guava:14.0"
   },
   {
     "name": "org.apache.commons:commons-lang3:3.1"
   },
   {
     "name": "commons-io:commons-io:2.4"
   },
   {
     "name": "net.java.jinput:jinput:2.0.5"
   },
   {
     "name": "net.java.jutils:jutils:1.0.0"
   },
   {
     "name": "org.lwjgl.lwjgl:lwjgl-platform:2.9.0",
     "natives": {
       "linux": "natives-linux",
       "windows": "natives-windows",
       "osx": "natives-osx"
     },
     "extract": {
       "exclude": ["META-INF/"]
     }
   },
   {
     "name": "net.java.jinput:jinput-platform:2.0.5",
     "natives": {
       "linux": "natives-linux",
       "windows": "natives-windows",
       "osx": "natives-osx"
     },
     "extract": {
       "exclude": ["META-INF/"]
     }
   }
 ],
 "mainClass": "net.minecraft.client.Minecraft"
}


Note: Remember to change the red colored words to the corresponding version.

Place the folder into the versions folder in .minecraft. Launch the launcher and your version should be registered.

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