I tried to login to the site using the details that you have provided in the first post of this thread but those details are not working anymore.
Cornerstone not loading after migration could be caused by several things. Firstly, the migration might not be successful to begin with. Another factor would be if the memory limit of your hosting is not enough. You might need to have the PHP memory limit of your site increased.
To do this, please edit your wp-config.php file and insert these lines:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
Here is a details article about the PHP Memory Limit that is in our Knowledge Base:
In case the issue persists, please try to get in touch with your hosting provider and confirm to them that your PHP memory limit is increased.
If you have enough memory limit but Cornerstone is still not loading, please double check that all the URL on the site is updated to the new URL. Please install the Better Search Replace plugin then do the following:
search for http://oldurl.com and replace it with https://www.the-foresters.com and
search for http:\/\/oldurl.com and replace it with https:\/\/www.the-foresters.com
http://oldurl.com with the domain name of your development site.
Let us know how it goes.