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Windows: Ensure that Tomcat is started by checking to see if icon in the tray is green or by using this command on cmd: wmic.exe process list brief | find /i "tomcat"
At the end of this process, the web page will refresh and /openmrs should be displayed under Applications. Apache Tomcat should also start the application (Running = True; and in Commands, Stop is underlined)
Another way to do this is unzipping the .war file directly under webapps folder in Tomcat and then restarting it. You will be able to access http://localhost:8080/openmrs and the installation wizard will show.