Yes I got the IE10 critical update notification also, but windows update doesn’t show an update for IE10, mine is for win7 32bit, so I don’t know if this is the same for 64bit OS versions.

As miguelgrado said:
“It seems a bug of microsoft and not avast .in internet explorer -about is correct version but not in properties of file”

The problem is that this mismatch within IE10 build number info makes the avast software updater believe there is a later version available.