Hi Alex,
Thanks for writing in! Your issue is not a license related issue. First of all, please review our migration guide here (https://theme.co/apex/forum/t/cornerstone-content-builder-migration/126) and make sure that you have properly migrated your website.
Then install the following plugin on both your old and new WordPress installations (https://wordpress.org/plugins/wp-serverinfo/), and compare the following information. Once you install the plugin, you can head over to Dashboard -> WP Serverinfo.
- PHP version - We recommend PHP v5.6.x or later to avoid incompatibility issues.
- PHP max script execution time - We recommend the value 120 or higher. If you see it’s set to 30 seconds, use the following guide and increase it (https://www.simplified.guide/php/increase-max-execution-time).
- PHP memory limit - We recommend PHP memory limit of 512MiB or higher. If you see a lower value, follow our guide here and see if you can increase it (https://theme.co/apex/forum/t/troubleshooting-increasing-php-memory-limit/16935).