Hello again @Adriano Faria,
I purchased your latest version, which is a good step in the right direction! Way to go!
However, I needed to invite users to groups, instead of people that are not yet members. As such, the "Send invitation" page should not show "Name" and "E-mail" in my case, but "Display name". That way, I can invite existing members to join a "better" group.
Sorry I wasn't clearer about that. I do hope something like that can be achieved - if not, please let me know.
All the best!