Hi @klevur,
Thanks! I’ve taken a look, and I see you’re using WordPress version 4.9.12 We generally only support as far back as three major releases of WordPress. You will either need to update WordPress to the latest version, or you could download the stability release of Pro from your dashboard page to get the previous version of the theme.
In this case specifically, WordPress added many javascript dependencies like React, ReactDOM and Babel part of WordPress core. It is best practice to always use libraries bundled with WordPress when possible, which is why they were removed from Pro. This is why Pro doesn’t load because many of the required scripts are unavailable.
On your Dashboard > Updates it says You have the latest version of WordPress. But that’s not true, latest version of Wordpress as of this writing is 5.3.
Updating WordPress
Remember to clear all your caching features (plugin, server-side, CDN, and browser’s cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Cheers!