Leon,
Be aware that AVAST purchased AVG a little while ago, so
you may get stuck with exactly the same messages.
AVAST free works just fine here with the occasional pop-up messages.
I just ignore them & close the box.
It auto-updates both the Definitions & the Program files.
AVAST has the same or very similar options in it's SETTINGS link, (top RHS)
on the main interface screen.
If, as you mentioned, you paid for AVAST, then you should be able to (check the SETTINGS), turn off any/all notifications.
Just take your time & check all the options offered.
You may like to peruse their support forum...?
>
https://forum.avast.com/index.php?board=2.0