You shouldn't have any problems with leaving the Chromecast on and running.
Patrick,
Thanks for replying and the link, but problems with leaving the Chromecast on and running is not what I was questioning.
The question is;
Is there a "proper" way to power down the CC dongle to assure that it won't interrupt an update, or possibly damage the dongle for whatever reason if not powered down properly?
Judging by the number of views to this thread and with lack of answer(s), I'm guessing a lot of others are like me and not sure either...

lol