docs: def download_urls(cls, urls, force_download=False):
          """Downloads all CTD URLs that don't exist
      
          :param iter[str] urls: iterable of URL of CTD
          :param bool force_download: force method to download
          """
          for url in urls:
              file_path = cls.get_path_to_file_from_url(url)
  
              if os.path.exists(file_path) and not force_download:
                  log.info('already downloaded %s to %s', url, file_path)
              else:
                  log.info('downloading %s to %s', url, file_path)
                  download_timer = time.time()
                  urlretrieve(url, file_path)
                  log.info('downloaded in %.2f seconds', time.time() - download_timer)