how can I claim a purchased plugin?

I have purchased the WP Online Contract plugin. And am quite annoyed. The plugin does not work. No matter what I enter, it doesn’t save anything, neither in the settings nor anywhere else. There is no support anymore. I want to complain about the plugins I bought from this author futuredesigngrp, because I can not use such crap. Please tell me how to do this. With ENVATO REACHES MAN YES ALSO NO

Here’s everything you might need:

How to get support/refund… Support Discontinued

How to leave a comment on the item/complain to the author…

Complain to Envato…

Envato Market Help and Support