Before update you need delete “woocommerce” folder in the directory wp-content/themes/royal/ and it’ll be reuploaded from a new theme package.
Also update all required plugins http://www.8theme.com/download-plugins/ .
Don’t forget to create back up of your files and database before starting update process!
(it’s for Legenda theme but the process is the same).
Please note you should overwrite parent theme files, not the child theme.