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.
Release Notes for Tableau 9.2.2
The Tableau Server maintenance release has been removed to address an issue with some Tableau Server environments that are configured to use Active Directory. If you are affected by the issue, install Tableau Server 9.2.3. For more information, see Release Notes for 9.2.3.