 The first step you have to do is simply right-click the Avast Antivirus icon in the taskbar of the computer device. After this, you have to click "Open Avast! User Interface"  After this, you need to click "Settings" in the upper right corner of the interface  Next steps simply click "Updates" option located on the left panel and then click "Details" to expand the section Do the following steps to disable the update notifications from Avast Antivirus

 Here simply un-check the "Show Notification Box After Automatic Update" box to disable update notifications  At the end, you need to click "OK" to save your changes.  Here close the interface to return to computer's desktop

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