Software updater does not seem to notify me of new updates with a pop up window. Just manually checked Thunderbird updates and there was a new update available, which was released on 23th day. I have refreshed the updater database a couple of times. Or does the notification window go away after some time, so i might miss it, if i'm away from the computer? I have the latest Avast Free. Also, i have checked the notification option from the updater.