The following steps are based on Prism Launcher:

1. Backup .minecraft;
2. Clear the existing .minecraft;
3. Enter git clone "repository URL" . in .minecraft;
4. Put the files from the backup .minecraft back into .minecraft, choose to overwrite or keep existing files as needed;
5. Add the following files:
   • .minecraft/.gitignore

     *
     !.gitignore
     !kubejs/
   • .minecraft/kubejs/.gitignore

     !*
     probe/