Of course, you could just download the new installer of instantOLAP and install the application in the same path again. But this has a number of disadvantages: 1. The download of the complete installation is much larger, 2. all of your personal settings in the server or for the instantOLAP would get lost and 3. the demo reports and the access rights and some other repository elements will be re- or overwritten with its original state again.
Therefore, this article describes, how to update instantOLAP when using the Apache Tomcat application server with some easy steps. The Tomcat server is included in the standard distribution of instantOLAP.