Unfortunately we haven’t tested Legenda theme with woocommerce 2.6.3, the latest theme update was released for woocommerce 2.6.2. You can update and check it yourself and notify us if there are any issues. Don’t forget to create back up of your site files and database before updating
The full compatible of the latest WooCommerce plugin and Legenda theme will be in the next update theme.
Right now you can update the plugin and check it yourself, but we recommended to make backup of the site before update.