2) Elementor also has the Maps elements.
3) Provide us with correct WP Dashboard access to your site and we’ll check the issue in more detail.
4) Are you talking about a link to download the invoice in the backend(in order details)? Yes, it’s for the admin. Also, your customer is able to find the invoice in his order.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.