1. In order to solve your issue, please you can read and follow the steps written in our theme documentation here: https://xstore.helpscoutdocs.com/article/148-xstudio-feature-of-xstore-wordpress-theme
Further, Live Copy/Paste feature for Elementor Page Builder, you can watch this video: https://www.youtube.com/watch?v=MYei56eV7mU&list=PLMqMSqDgPNmCCyem_z9l2ZJ1owQUaFCE3&index=23
2. Yes you can use our theme for testing purpose on localhost as well.
Regards 8Themes Team.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.