Avoid buying Avast or other Piriform products! And pop ups by CCleaner

I have CCleaner and have used it for years. When you’re not even using CCleaner, they occasionally send these pop up messages that commandeer your screen, hoping you’ll buy their “optimize your computer performance” stuff.

You have to really hunt around to try to make their pop ups go away. I tried to contact Ccleaner but of course they don’t have the courtesy to have anyone who works there. Instead, I have to come here to a forum, and ask other users, to tell me how to fix the problems that they are creating for me.

So…how do we get rid of these stupid advertising pop ups from Ccleaner? Ccleaner is owned by Piriform, which is all part of Avast software.