yeah...we will soon announce end of support of these OS..
Large numbers of Avast users use XP -see other forums.
https://forum.avast.com/index.php?board=2.0.. We use it precisely to avoid all the bizarre issues that show up on later versions of Windows (maybe not Win7). Personally, I use it as a VM on my Mac, running flawlessly under Parallels, for all non-internet work, but need antivirus since XP files are accessible when shared with the Mac OS. The 18.4 version of the Avast Free Antivirus program introduced something that does not work with most installations of XP. I reverted to the 18.3 version, which works fine. Presumably we will still be able to use updated virus definitions, running on 18.3 Nevertheless it would be nice if Avast would fix the problem introduced in 18.4 I have not tried the new beta, and will not until someone posts that it fixes the problem.