code: def install(package_name):
      
      holodeck_path = util.get_holodeck_path()
      binary_website = "https://s3.amazonaws.com/holodeckworlds/"
  
      if package_name not in packages:
          raise HolodeckException("Unknown package name " + package_name)
      package_url = packages[package_name]
  
      print("Installing " + package_name + " at " + holodeck_path)
      install_path = os.path.join(holodeck_path, "worlds")
      binary_url = binary_website + util.get_os_key() + "_" + package_url
      _download_binary(binary_url, install_path)
      if os.name == "posix":
          _make_binary_excecutable(package_name, install_path)
docs: Installs a holodeck package.
  
      Args:
          package_name (str): The name of the package to install