1(recommended). With the Pax file of the new release, install the entire system again, but specify to use the old database
2. replace the WAR file in the webapps folder under the tomcat installation. Be sure to delete the VantageGMI folder, because this will be extracted again at start of the application.
Do you need to delete the existing Vantage Web Client?
Specify the same location for tomcat and database. But it is recomendeded to delete those folders before installation.