code: def download_series_gui(frame, urls, directory, min_file_size, max_file_size, no_redirects):
  	
  
  	# create directory to save files
  	if not os.path.exists(directory):
  		os.makedirs(directory)
  	app = progress_class(frame, urls, directory, min_file_size, max_file_size, no_redirects)
docs: called when user wants serial downloading