To apply an upgrade for the press the :guilabel:`Upgrade` button. This will bring up a prompt for Update Notifier with lxqt-sudo for you to authenticate applying updates. After this happens in the center will be a large progress bar showing the progress of installing. Press the :guilabel:`OK` button after entering your password. Once the update is done press the :guilabel:`Close` button.
To launch Update Notifier :menuselection:`Preferences --> Apply Full Upgrade`, press the :guilabel:`Apply Full Upgrade` from LXQt Configuration Center, or from the command line run