Author name missing

Hello! (wow, I’m the first to ask for support here!)

First of all thanks for your plugin, I downloaded it some days befor and I find it very useful.
I have one issue/question for you:
It seems I’m not able to display author information as nickname and avatar (checked in the profile for where it says “http://www.latorredicotone.com/pattern-cappello-da-orsetto/”).

Do you have any idea on what the problem would be?

P.s.: the site is currently in maintenance mode as I’m working on it, but if you wish I can open it up for you to check.

Thanks for your support!

https://wordpress.org/plugins/easy-digital-downloads-frontend-submissions-product-details-widget/