Just download the latest app (via releases) and start it via
java -jar ScrumTool-VERSION.jar
https://github.com/fo0/ScrumTool/wiki
Latest Stable: https://github.com/fo0/ScrumTool/releases
for applying configurations just create a spring application.properties file in the folder of your scrumtool.jar and add the following properties
scrumtool.database.inmem=false #default=true