Upgrade does not work

This is a promising app but it needs work. It is very limited.
More irritating is that they released an upgrade that does not work. The upgrade wiped out my teams calendars. No one to call for help fixing this major error. You have to email support and wait. It is not ok to wipe out a teams calendar that has been meticulously entered.

All the usernames are taken about Teamstuff, v2.4.0