Same problem here.
I found some odd other things and I think they concern the same issue:
- Once you install the plug-in you get the “Integrations”-Tab and the “CF7 Redirections, Integrations and Database” Plug-In is activated.
- The “Manyforms”-Plug-in gets installed as well but can’t be activated.
- Error-Message: Fatal error: Uncaught Error: Call to a member function set_basename() on null
- The “Manyforms”-Plug-in is not activated but appears availlable in the dashboard
- Inside the Plug-in you can register and save your webhook and it works with Make/Integromat
As you can not register the trigger in the form directly, you can not stop the email from being sent. Ugly solution for me at the moment is just to use a trash-mail and generate the response in Make.