You don't have PS CC, you still use CS6. You must install PS CC. It's a separate program.
I see. Opening the Creative Cloud download and update manager, you have to scroll way down past all the CS6 versions of everything to the CC versions, which apparently don't get seen as updates even when you purchased a Creative Cloud membership and only ever installed any Adobe software through it. So it will tell you your pre June 17th install of Photoshop is up to date and never once mention or prompt you to update or install to the CC version.
So it looks like I'll need to re-install everything to the CC version, like 10 days after I installed them in the first place.
Do I need to uninstall the CS6 versions?
This is the wierdest update method.
The "CC" apps are separate applications to the CS6 apps -- so your Photoshop CS6 install *is* up-to-date!
You don't need to uninstall the CS6 apps to install the CC versions if you still need access to them.
I've now tried it on a couple of photos, but they were either too low light (I think the extreme grain throws off the algorithm) or the shake was too extreme, or both for it to work well. I can see it trying though!
I suspect the jitter has to be in a sweet-spot range, so probably hand-held photos of things in sunlight or bright studio lights, where a little hand shaking softened features a bit, are ideal. It seems like if it gets more extreme than that, it can't bring everything together, though even then you can see it edging closer.