Looks to be fixed. As to php version, if you do go ahead and bump up to 7.2 again, though you will likely have issue with the ZC software as ZC 1.5.5f isn't 7.2 compatible would suggest either of the two versions of this plugin that have been "issued", though haven't looked at what is done with the database when the "tell-a-friend" portion is addressed in the version downloadable from this site.

If it removes the existing entries from the database, then that would cause page not found responses that may have otherwise been handled by the software.