A common issue that can occur with users new to installing WordPress themes is a "Broken theme and/or stylesheets missing” error message being displayed when trying to upload or activate the theme. This error message does not mean that the theme you have purchased is broken, it simply means it has been uploaded incorrectly. Luckily, there is a very easy fix.

No. The price you’re purchasing the theme is one-time and is final (no recurring payments). You don’t need to buy additional plugins or subscriptions in order to use the theme. Everything you need to run the theme the way it’s showcased in the live demo is bundled to your download package.

Please learn more here Elementor Pro FAQ

Yes, it’s built upon Elementor as any other theme page. Everything you see in the live preview is included as part of theme demo data. Basically you’ll get a mirrored copy of live preview after the theme installation and demo import.