It says I am a subscriber, dunno what this popup was about, says I'm not subscribed. If I see it again, I'll take a screenie.
It is sounding more like promoting another Avast paid product.
I get them occasionally on the Avast Free antivirus, whilst it might/could be a weakness that isn't covered by what you have. You have a headache, I have an aspirin, that will be xx$ For me they are either covered by another tool I have or I'm not particularly concerned about the issue.
The one thing I would recommend is making regular backups of your system to an off-line SSD/HDD device. I do a full system backup monthly and a data backup fortnightly. Should the worst ever happen I'm pretty much covered.