Problem with my Theme i think

hi,

I bought a theme that does not work with your plugin. Or othewhise 🙂

In this Window, where i can choose my download for a post….I can click what I want, nothing happens.

https://picload.org/image/rdooalpr/ins_dl.jpg

The Theme cost a lot of money, I would like to know what I can do.
The support of the theme has not answered for months.

You are my last hope (theatrical) 🙂

What can i do?
It is this theme:
https://themeforest.net/item/modern-vintage-one-page-wordpress-theme/8375110