Hi, Kamil!
I not used a installer.
My main system - CentOs 5.5.
What version of eclipse are you use?
I through the menu Install soft - did instalation the JBoss tools, and after try install BPMN2.zip. But i not saw any jar files of plug-in in the Eclipse folders (plugin and features), and not saw the menu item BMPN diagram during creation files. But into the list of plugin the BPMN has status enabled . Strange. This is possible to do install of the plugin without jbpm5 installer?
Thanks!