Navigate to your AVG install folder, locate a file called avgfree_us (it'll have a html extension) & rename it to avgfree_us.old
Likewise, navigate to the AVG/Notification folder & rename the upgrade-oportunity-avg85-message1 & upgrade-oportunity-avg85-message2 html files accordingly. G
P.S. It's just something I made up just now, going by similar instructions to prevent pop-ups in another program! I tried the above on my PC with no ill-effects so far. There's no guarantee it'll work to stop the pop-ups, but if there's any problem at all, just rename them to their original file names
Just tried crossbow's fix and no change, still getting the notification dropdown. More difficult to know if the pop-up fix has worked, suppose time will tell. Do I have to re-boot to have them take effect?