Associating Store Locator Plus locations with WooCommerce products is a new feature provided by the Premier plugin for Store Locator Plus. The Premier plugin is an add-on that is available exclusively to Premier Subscription holders.
In order to activate the WooCommerce product mapping features of the Premier add-on, you will need to WooCommerce installed and activated on your site. When WooCommerce is installed the WooCommerce modules are automatically activated within the Premier add-on. You should activate WooCommerce before importing locations with WooCommerce product relations.