Tableau Server 2018.2 comes with a new web-based server configuration utility called Tableau Services Manager (TSM). Upgrading to this version requires special steps. Please see this article for instructions on what has changed to ensure your upgrade goes smoothly. If your install is hung up around either 12% or 76%, please see this article for resolution.
Installation Guide
Install and Configure Tableau Server
Planning to upgrade?
Tableau Server Upgrade Page
Release Notes for Tableau 9.1.7
This release addresses an issue with Tableau Desktop on the Mac. For more information, see the Tableau Knowledge Base.
Note: Tableau Desktop customers in environments with Product Updates enabled will be prompted to upgrade a few days after a maintenance release is made available. For more information, see the Tableau Knowledge Base.