Thanks for this response 
But When It Comes to Learning IT
My Brain Tends to 
No need to buy Pro to get rid of these messages.
In Avast Free Antivirus, just go to Settings > General > Notifications and tick the box “Use silent mode and turn off all pop-ups, alerts and messages”.
Philip
Not sure as I haven’t tested but would that not stop the alerts for updating Definitions - which I never leave on automatic I like to know when things are doing updates as they can slow machines or pause start-up or shutdown - not good if you are in a hurry Just the control freak pedant here 
We run a very large enterprise (30,000+ devices) on Windows Defender and also use Zscaler for web filtering.
You wouldn’t expect to use something like Zscaler in a domestic setting however common sense when browsing sites, opening attachments and sharing personal information is a requirement for being let loose on the internet, maintain your software patch levels too.
Yes, it does stop those alerts. I let it update the Definitions file automatically (can’t see any reason not to), but I do any Program (sic) updates manually.
I run both SUMo and Patch My PC Updater daily, so I am always aware of which of my programmes have updates available, although I tend to do the updates myself manually.