With all due respect sir... there are 200 Mil users of Avast... However, there are not 200 Mil users of the latest version...
The program doesn't notify of a new update unless you specifically go looking for it and that eliminates MOST people from that list.
Another segment, even if they do see there's an update don't bother because they are not tech savvy and/or don't care to update now
Another segment are tech savvy and are just waiting to see if there are bugs
Another segment just don't want to update because they like the version they have
This update only came out about 2-3 weeks ago... of that, there were plenty of complaints on these forums, enough so to call this a buggy piece of software as far as I'm concerned. I am currently using it on two computers and for the most part it is functional (for me, even though I can list a dozen small bugs), but as was evident by all the posts in very short period of time... many users are having many issues and to classify them as a "few", is off.
I am an avid supporter of Avast, and it's ok to call it buggy... it doesn't undermine the fine people of avast or their great products and I'm sure they will fix it... but when someone has gone to the point of reinstalling windows trying to chase down the bugs... it's time to pack it up and just wait for avast to release a better version.