We have had this theme for a few years, but the development team that put this together doesn't update it to work with the latest versions of WordPress for too long. Definitely pick a theme by a different developer if you want a working WordPress themed site.
At one point this was a very good theme but the developers haven't kept it up to date. For over six months now I've been told they were releasing an update to make it WP 5+ compatible but nothing so far. Time to move on to something else but very disappointing.