1 and 4. Our Shop AJAX and load more button don’t work if you create the shop page with Elementor PRO. You need to disable these functions or use the standard WooCommerce shop page.
2. You are using the Elementor header that replaces our header builder. And it is currently empty http://prntscr.com/116ba17
If you want to use our theme header builder then you need to disable your header layout.
3. It doesn’t work since this widget is a part of our header. So you need to use our header builder to be able to display it.
Could you please clarify the problem with RTL? Provide us some screenshots.
As for the addons plugin, please, provide us your FTP access so we can troubleshoot the problem.