Hello!!
Well, yesterday in the evening problem solved.
I turned on my computer and soon after, a pop-up windows on the right corner in "Notification area" displayed. It was "Avast" window informing that "Virus database" had just been updated. It showed in the window 12-12-03 .
Anyway, after that, I looked in my UI, on main antivirus interface window ( The main window).
There, there are some data preceded by a colon. In the 2nd or 3rd line you can read: "Virus definitions version: 121203-0".