Hello,
Yes, you understood correctly regarding Revolution Slider license. You have to buy it if you want to receive automatic update and support from the plugin authors.
You shouldn’t worry about those notices. They won’t affect your site at all. We edited Woocommerce files in wp-content/themes/legenda/woocommerce directory and old version may be written in those files. But, please don’t worry, as the original version is written in wp-content/plugins/woocommerce/templates directory.
So you can hide this message or you can fix it by editing the files in wp-content/themes/legenda/woocommerce directory and change the version to the current Woocommerce version that you’re using.
Regards,
Eva Kemp.