I am writing in relation to the specified addon, but the problem applies to all Addons.
The problem is as follows: wpDisquz 5 has stopped supporting guest comments, at least when using Addons, and it returns an error when sending a comment.
However, it still works with authorized users.
wpDisquz 7 works with guest comments, but when you try to install Addons, the site design breaks down. And in the add-on management console, attempts to save the entered settings lead to a critical error on the site. I think Addons are not compatible with wpDisquz 7.