Win10, after reset...
I tried a dozen variations on the above, and still couldn't find the magic combo, but I know someone here does. That's what Adobe support says too: The top tier arcanists all work the forums now.
In purest love now, forever and always true,
Although the steps in Adobe Creative Suite 6 applications unexpectedly revert to trial mode seemed identical to steps I'd already taken, they seem to have worked. Perhaps I was logged on the whole time, and should only have logged on after submitting the key. Anyhow, that link held the magic combo. Thank you, sage Rajashree.