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Did the same to me and I'm usually pretty good at spotting stuff like that, I used to like avast! that's put me off them even more than the increasingly irritating nag screens they've employed over the last year or so. However I'm even more pissed off with Piriform, I downloaded the ccleaner update from their website and as with -pops- saw no notification that they'd piggybacked anything else and at no point was I asked if I wanted to install it, it just appeared. I had a notification that Windows Defender was deactivated which surprised me greatly then it told me I was protected by avast! which I hadn't chosen to download or install. Very shabby after years recommending it I think it may be time to look for an alternative.
That's right; CC got hacked with a virus just as Avast was taking over.
I am a bit more cautious since that and typically do not click on the check for updates button within CC.
I go direct to the piriform site