To get this package to completely install silently (Yes even get rid of the "Use the EREG_RUN mandatory property")
You will only need Orca and change the value of the following properties in the PROPERTY Table:
ISX_SERIALNUM: XXXXX-XXX-XXXX-XXXX-XX (of course your real serial number in this format)
PROD_ACT 0 (Gets rid of product activation during installation, will ask you to activate the first time you start the program)
PROD_REG 0 (Gets rid of the nasty msg "Use EREG_RUN mandatory property during silent installation")
And thats it!
Off course I trust you generated a new transform before you edited the values ;)
Enjoy your GPO or /qb! deployable msi package :)