Thank you, I see now that my Office 2016 keeps updating without notifying me among other windows updates, nor showing it among installed updates.
What is still not clear is the Office 2013 updates. In the first weeks after I'd upgraded to Office 2016, they failed to install, so I gave it up. Now, after your question, I tried again and they did install, also appear among the installed updates. Didn't it do any trouble in my Office 2016? Now I always see the notifications about new important windows updates that turn out to be irrelevant, as relating to Office 2013, can't I stop receiving these?