I got a notification for update to that version, most times I ignore those updates since many are purely cosmetic and don't really change much from prior versions. This time I accepted it, it's been a year or so, so I figured it was time.
Win10Pro, If that helps.
Makin a mountain out of a few grains of sand. Not even a mole hill. It's CCleaner. You either use it or you don't. If you don't, there's nothing to upgrade, it's not malware that's suddenly going to install and make you use it unawares. If you do use it, you have given Avast permission to be installed. Nice little 'I Agree' button. It's CCleaner. It's not going to ask you to verify every single thing it does. Can I have permission to look at your files. Can I have permission to open this browser history. Can I have permission to decide if this is junk or not. WTH. You agreed to let it do its thing. If that means it auto updates to be in better compliance with the rules, so what. If it auto updates to something that worked better, did a better job, protected you better, saved your ash then you'd not say a thing but thanks. You said 'I Agree', you are trusting piriform to do the right thing. In this case, it's doing the right thing for itself, not necessarily for you. Get over it.