public function install() {

		$ret = LLMS_Helper()->upgrader()->install_addon( $this );

		if ( true === $ret ) {

			/* Translators: %s = Add-on name */
			return sprintf( __( '%s was successfully installed.', 'lifterlms' ), $this->get( 'title' ) );

		} elseif ( is_wp_error( $ret ) ) {

			return $ret;

		}

		/* Translators: %s = Add-on name */
		return new WP_Error( 'activation', sprintf( __( 'Could not install %s.', 'lifterlms' ), $this->get( 'title' ) ) );

	}