Users running a non-download version of Vanilla (pulled from github), on branch release/2019.016 or master from the last 2 weeks should upgrade to release/2019.017 or latest master for security reasons. Downloaded official open sources releases are not affected.
TopicsOnly redirects unauthenticated visitors away from comments and the search page. This means that although guests are able to view the categories and discussion topics they will not be able to view the actual comments. Instructions included to redirect to a custom page.