Reading the Readme I see:

Discontinued Functionality or Features

This version does not include the following items:

JBoss Community Edition

The .iso for this version of Identity Manager includes an
installation program for the Tomcat application server instead of JBoss
Community Edition.

I have yet to read far enough, but worth asking to clarify...

That means you can run the WAR files under Tomcat instead of JBOss?
That seems like a lighter stack to support, which would be a step forward.