Hi Bryan,
yes it appears in "Addons":
The funny thing is that when you open the RAAS menu, the master volume alwas is set to off (left). Even you set it to the middle and save, no announcements on the runway. The audio test works though.
It is ensured that the PMDG model has RAAS activated in the FMC:
I am not only one who has problems with the PMDG 747 after the new update/747-8 Expansion. See the PMDG support forum. I applied a ticket at PMDG but was asked to talk to you regarding this matter.