protected function is_theme_version_valid( $slug, $version ) {
		// Get Theme Info.
		$theme_info = themes_api( 'theme_information', array( 'slug' => $slug ) );

		// Return empty string for themes not on WP.org.
		if ( is_wp_error( $theme_info ) ) {
			return '';
		}

		// Compare theme version info.
		return ! version_compare( $version, $theme_info->version, '>' );

	}