input: Below is an instruction that describes a task. Write a response that appropriately completes the request.
  
  ### Instruction:
  This code is a Python script that provides a command-line interface to download subtitles for movies and TV shows. To use it, run the script and provide one or more release paths as arguments. You can also specify the language and subtitle site to use. The available commands are "download", "exist", "test", "list", "help", and "version".
  
  ### Input:
  
  ./subtitles_client.py download /path/to/movie1 /path/to/movie2 --lang=en --engine=subscene
  
  
  ### Output:
  
  [subscene       ] Trying To Download Subtitles For: 'movie1'
  [subscene       ] Trying To Download Subtitles For: 'movie2'
  
  
  
  def download_subtitles(releases, engines=[DEFAULTS['subtitle_engine']], lang=DEFAULTS['subtitle_language']):
      """
      Download subtitles for given movie or TV show release paths. Allows specifying the 
      language and subtitle site.
      
      >>> download_subtitles(['/path/to/movie1', '/path/to/movie2'], ['subscene'], 'en')
      [subscene       ] Trying To Download Subtitles For: 'movie1'
      [subscene       ] Trying To Download Subtitles For: 'movie2'
      """
      if releases:
          for release in releases:
              for engine in engines:
                  subtitle_release = SubtitleSite.get_file_properties(release)['release_name']
                  print "[{engine: ^15}] Trying To Download Subtitles For: '{release}'".format(engine=engine,
                                                                                               release=subtitle_release)
                  sub_obj = SubtitleSite.class_factory(engine)
                  subtitle_path = sub_obj.download_subtitle(release, lang)
                  if subtitle_path:
                      print "{0:17} Download Success: ({file_path}).\n".format("", file_path=subtitle_path)
                  else:
                      print "{0:17} Subtitles Not Found.\n".format("")
output:     else:
          print "No release paths provided."