The new version wrecked my test pc. The system partition got corrupted. I have a multi boot test PC and first I tried the new update of Avast on a Win8.1-32 OS. At reboot Windows says cannot load user profile. It booted with a blank desktop. At next reboots the Boot menu or the manufacturers Start Logo was not shown anymore. Just a black screen.
Tried repairing Start up with Win 8.1 and Win10 installation disk/USB. They couldn't repair. A fresh Installation of Win10 wouldn't reboot either.
The only solution I found, happily, restoring the System partition from an old backup. But the menu choices didn't work: No OS was bootable.
Then I installed a fresh Win10 on an available partition, and that did work this time. Next I added all OS's of the multi boot PC to the boot menu and now they all work again. I don't dare to update Avast again for the first months....
AND why is the current year 2018 in the captcha?