I have recently installed Activiti and had help to get the modeller installed. All works fine.
My demo appears to have been installed correctly and is running yet I am getting the following error when trying to open http://localhost:8080/activiti-explorer
type Status report
message /activiti-explorer
description The requested resource (/activiti-explorer) is not available.
Please look in you Apache Tomcat webapps folder to see if there's an Activiti Explorer WAR there. If so, please look in the Tomcat logs for error stack traces.