Looks like it's Patch #2118a.57
I had to download it in order to view Prometheus 4-Disc Collectors Edition. When I tried playing the standard non 3-d Blu-ray disc PowerDVD prompted to download a new patch in order to function correctly. I did not attempt to try playing it without the patch as their was an opportunity to back out. I think in the past when I attempted this with other discs, it just would not play them.
Gonna watch it tonight after this update completes! I can't wait!! Saw it in IMAX3D and it was spectacular! --
Remember that cool hidden "Graffiti Wall" here on BBR? After the name change I became the "owner", so to speak as it became: Dustyn's Wall »[Serious] RIP