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looks like some issues with automatic installation of eclipse. You can install demo by installing eclipse first and point the install script to already valid eclipse installation. You will need to specify that in build.properties file in jbpm-installer.
for the error with jni see this http://stackoverflow.com/questions/24589932/mac-os-jdk1-7-and-1-8-does-not-contain-the-jni-createjavavm-symbol
It worked perfectly now, Thanks Maciej.