Hello @mpalinkas,
Thanks for writing in! Are you trying to migrate the site to another WP installation? It is best that you review this article on how you migrate a site: https://theme.co/apex/forum/t/cornerstone-content-builder-migration/126/1
If you have only change the location of the files, you will have to update the urls in Settings > General > Site URL and then install Better Search and Replace. You will have to search for the old location url and replace it with the new location url.
Hope this helps. Please let us know how it goes.