I checked your site and see that it’s impossible to save a page even with the default theme. So, our theme is not the reason of the issue. Contact your hosting provider, ask them to check the server error logs and help you to fix the issue. We are able to help only in case error caused by our theme. If page saving does not work even with the default WP theme we can do nothing.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.