system
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About sounds, you should double check that you have Settings → popups in some “normal” value (20 seconds is default).
Also, for now the sounds are related to the tray notifications (might be changed in the future to be independent). So, are you currently seeing updates tray notifications?
Please review the following settings (in any case):
Avast main GUI → Settings →
Updates → engine and virus definitions → automatic.
Updates → details → update options → all options checked.
Silent/gaming mode → UNchecked
Status bar → definitions auto updates checked
Sounds → all checkboxes checked
If you see the tray notifications, while you actually see one tray notification, you could open the Volume Mixer (right click on the volume icon at the tray area and select Volume Mixer; NOT double click), you should be able to see all active apps having volume settings. While the update tray notification is being displayed (you just received a database update), the Volume Mixer should include also one Avast column for its volume. Review that the Avast column is not in “mute” and its volume is not zero.