Yes! As you know, the Free Gifts for WooCommerce is a premium product that is sold through iThemelnadCo. For each purchase, you will be assigned a purchase code and you can use this purchase code on only one website, so to use the Free Gifts for WooCommerce on your various websites, you need to separate licenses for each site.
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If after reading the articles you still think have unanswered questions or need custom work for your plugin, contact iThemeland Support.