Please read our documentation https://www.8theme.com/demo/docs/royal/#!/installation_upgrade
I’ve checked your site and seen that current theme version is 3.0.2.1 (the latest) and WC 3.1.1 v, but you don’t have outdated files. Please delete “woocommerce” folder, which is located in wp-content/themes/royal/ and upload “woocommerce” folder from the latest theme archive (that you may download on Themeforest). Then you will have a notice about outdated files, but that won’t make an effect on work of your site, and will be fixed in new theme update.
Regards