I had to re-authorize AD2 as well, although the XLN on-line installer ran fine.
 
The Anniversary update messed up my backup program (EaseUS ToDo Workstation). It started reporting errors on every partition I tried to back up. EaseUS got me a patch very quickly, now all is fine.
 
Since the update, my Fireface UFX will work fine for about a half hour, then start producing a nasty distortion that sounds like ring modulation. Haven't solved that yet, but it might be related to the next item.
 
After the update, all the NVidia HD audio controllers re-appeared in Device Manager. I disabled them all, along with the System Device HD audio devices. But I'm thinking I should re-install the latest NVidia drivers with a clean install, choosing only the video drivers and PhysX.

TBH, after going through the list of whats in the update, I think I will give it a big miss. None of the stuff really interests me. It seems Cortana and Edge are the "big ticket" updates and as I use neither, I can see no real reason to change things. This is assuming I continue to get "regular" updates without being forced to take the Anniversary one, and at this stage this seems to be so.