# Must be set for datasets that use 'data_dir' functionality - the ones
    # that require users to do additional steps to download the data
    # (this is usually due to some external regulations / rules).
    # This field should contain a string with user instructions, including
    # the list of files that should be present. It will be
    # displayed in the dataset documentation.
    @property
    def manual_download_instructions(self) -> Optional[str]:
        return None

    def _check_legacy_cache(self) -> Optional[str]:
        """Check for the old cache directory template {cache_dir}/{namespace}___{builder_name} from 2.13"""
        if (
            self.__module__.startswith("datasets.")
            and not is_remote_url(self._cache_dir_root)
            and self.config.name == "default"
        ):
            from .packaged_modules import _PACKAGED_DATASETS_MODULES