Version cloning

This guide will be useful for modpack creators and players who want to keep multiple modpacks for same version using "Subfolders" feature.

info

This page requires localization of screenshots. Feel free to open PR if you want to help

How to clone a version?

note

This guide assumes you're using "Subfolders" feature

1. Start Legacy Launcher
2. Click "Open game folder" (the one with folder icon) button to open game folder
   • Launcher may ask you to select a folder. You should select "root folder"
3. Open versions folder
4. Find a version you want to clone and copy it
5. Choose a new version name. We will use MyCoolModpack 1.19.2 for this guide
6. Rename created folder copy to selected name
7. Open renamed folder. Rename both jar and json files to the same name as folder.
   warning

   Folder name must be the same as contained files names, otherwise the launcher will not be able to detect this version.
   For example: if folder name is MyCoolModpack 1.19.2 it must contain MyCoolModpack 1.19.2.json and MyCoolModpack 1.19.2.jar files, all other files will be ignored.

8. Open renamed json file with any text editor (e.g. Notepad++)
   note

   You should not use any office suite

9. Find id field and replace it with selected version name

   {
       "id": "MyCoolModpack 1.19.2",
       "jar": "1.19.2",
       "family": "Forge-1.19",
       "time": "2023-09-16T19:39:53.686Z",
       "releaseTime": "2022-08-05T11:57:05Z",
       "type": "modified",
       "mainClass": "cpw.mods.bootstraplauncher.BootstrapLauncher",
       "minimumLauncherVersion": 21,
       …
   • If you're using "Subfolders" feature in "Separate folder for each family" mode you must also rename the family field. The family name is not required to be the same as the version name, and you can use one family name for multiple versions

     {
         "id": "MyCoolModpack 1.19.2",
         "jar": "1.19.2",
         "family": "mycoolmodpack",
         "time": "2023-09-16T19:39:53.686Z",
         "releaseTime": "2022-08-05T11:57:05Z",
         "type": "modified",
         "mainClass": "cpw.mods.bootstraplauncher.BootstrapLauncher",
         "minimumLauncherVersion": 21,
         …
10. Save the file
11. Restart the launcher. Cloned version should appear with the selected name