Purchase a FooSales for WooCommerce licence from the WooCommerce Marketplace. Download the FooSales for WooCommerce plugin from your WooCommerce account and install the plugin on your website.
Go to FooSales > Settings in your WordPress dashboard to make any required changes and customizations using the setting tabs.
Go to FooSales > Point of Sale in your WordPress dashboard to launch the FooSales for WooCommerce app or enter the address manually in a web browser: https://yoursiteURL/foosales/
Automatic plugin updates should work seamlessly, however, as best practice we recommend ensuring that your site is always backed-up first before updating any plugins.
If you encounter any issues relating to the shop/category pages after a plugin update, please flush the permalinks by going to WordPress > Settings > Permalinks and clicking Save. This should revert things back to normal.