I have had no luck with ModuelGardens WordPress Manager or really any of their plugins. I would love that they really spend some time on WordPress Manger as it could be really useful. We have had lots of problems with WordPress Manager detecting WP installs. So far its junk and so is their support. I would not recommend this plugin or any of their plugins.
To be honest I think most of these reviews are not real reviews and have not even used their software.
As explained via ticket, problems may occur if you keep using the module in a version that is not compatible with your version of WHMCS. However, according to your feedback shared with the WHMCS community, all encountered issues have already been successfully disposed of with the help of our team.