1), 3) Provide us with WP Dashboard access to your site to check the settings that are used there.
2) Provide us with the screenshot of the “buy now” area that you are talking about for better understanding.
4) To add the footer go to Appearance > Widgets > add the Static block widget to the Footer widget area. Choose the Static block with footer content that you want to show there. Also, don’t forget to enable page builder to edit Static blocks https://xstore.helpscoutdocs.com/article/47-static-blocks
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.