"Your theme (The Hanger) contains outdated copies of some WooCommerce template files. These files may need updating to ensure they are compatible with the current version of WooCommerce. You can see which files are affected from the system status page. If in doubt, check with the author of the theme."
In case you're seeing a notification in your administration dashboard saying the theme includes some outdated WooCommerce templates, it means you've recently updated WooCommerce but haven't updated the theme yet. The latest version of The Retailer PRO is always compatible with the latest version of WooCommerce.
Updating the theme to its latest version will fix the outdated templates.