I’ve tried the free version, and the registration form doesn’t work (cannot displayed on frontend).
Tried with shortcode, with Elementor, with Gutenberg – none at all.
Hope you are well. And sorry for the inconvenience. if possible, can you please, give your temporary wp-admin login details in a private reply to check the issue?
You need to check Anyone can register option from WP-Admin > Settings > General, I have checked it now user can register on your site. However, appearance not coming properly maybe with your theme script conflict. Please kindly check and let me know.