I am using moodle cloud, which doesn't allow me to install plugins. However, the cloud has this plugin installed already, and it is working fine aside from the fact that the version 2.6 messaging tour is deleted and I can't personally see the tours work on my own account. I've had to sign in as a different person to see them work (though I can build them).
Thank you for your response, though. I appreciate it. If you have more ideas...