I've located all the points in the code where version 1.5 is explicitly checked for and have now created patches for the trunk, as well as the Outcaste, and Release_1.1 branches in a tarball here. Of note are the fact that ProxySplashscreen.class, and, for the branches, AnathemaBootLoader.class...
I hate to play thread necromancer here, but I felt it necessary as I debugged the above issue reported by wordman (i.e. the java.lang.ExceptionInInitializerError and java.lang.NullPointerException bug in net.sf.anathema.Anathema.startApplication and net.sf.anathema.AnathemaSplashscreen.<init>)...