I have stand-alone LR 6.1 and the last pre-CC PS.
I was (fortunately) away when LR 6.2 came out, and the brown stuff had hit the fan in earnest by the time I got home, so I skipped that downgrade.
A few days a go I took my chances on updating from inside LR 6, in the Help menu, "Check for updates." It worked perfectly fine for me (Windows 7 64)., with no unseemly effects so far.
So it may be safe to go in the water again.
-Eric