docs: def download_file_powershell(url, target):
      """
      Download the file at url to target using Powershell (which will validate
      trust). Raise an exception if the command cannot complete.
      """
      target = os.path.abspath(target)
      cmd = [
          'powershell',
          '-Command',
          "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" % vars(),
      ]
      _clean_check(cmd, target)