code: def get_download_progress(self):
          
          downloaded = CRef.cint()
          total = CRef.cint()
  
          result = self._iface.get_dlc_download_progress(self.app_id, downloaded, total)
  
          if not result:
              return 0, 0
  
          return int(downloaded), int(total)
docs: Returns tuple with download progress (for optional DLCs):
  
              (bytes_downloaded, bytes_total)
  
          :rtype: tuple