No, that would not work for your server may have a different configuration from ours and we don't have your SSL certificate for the URL.
The fact that you manually change the URL on Settings > General and the Mix Content Warnings (see screenshot below) that your site is throwing, this means your plugin failed to change all the URL from
https entry on the database and that causing the Cornerstone not to work properly.
Try to use the Better Search Replace plugin instead, follow the advice provided here.
Remember to clear all your caching features (plugin, server-side, CDN, and browser's cache) after updating so the changes will take effect immediately.
Let us know how it goes,