This release requires Django 1.11 and Python 3.6 or newer. It is **not** backwards compatible with the previous releases. Please check the doc for how to upgrade your existing T7 sites http://tendenci.readthedocs.io/en/latest/upgrade/upgrade-to-tendenci11.html.
A lot of community contributions went into this release. Thanks to all who helped. Among them, PaulSD's contribution is enormous. Thanks Paul!