Well, I managed to install the update, after a series of frustrating attempts at "check for update" produced nothing but a disappearing status bar (thank you LauraPony for the advice to power off and restart).
The Vox continues to randomly wake from sleep, which I thought this update was supposed to fix, but just read from James that it was actually the "wake from sleeping" issue that was addressed, not the "wake while sleeping" problem which I am apparently experiencing. I may have had the other condition, too, without knowing it, but now I am assuredly cured of that malady. And then there is the life-threatening "died in its sleep" illness (good one Haesslich!) which I experienced 2 days ago, that lurks, waiting for an opportunity to once again kill the poor Vox patient.
Can't wait for the next update!