Re: I think Avast is a virus :-)
CCleaner (Piriform as a whole) is now owned by Avast and "an offer" to install it comes with every CCleaner free install.
If you choose the "typical" installation you'll get it for sure. I tell everyone two things if they want to avoid the installation of software bundled with other software they want:
1. Get Unchecky, install it, and leave it there to do its job. It's resource footprint is minuscule.
2. Never take the "typical" install option. Always choose customize, which gives you the full view of what the installer intends to do at each step, including the installation of other bundled software, so that you can make intentional choices.
You do not need to purchase the paid version of CCleaner, or virtually any "free" program, to avoid the loathsome practice of bundling but you do need to NEVER take the "typical" install, at a minimum, and it's really helpful to use Unchecky in case you might happen to miss one of the checkboxes you'd need to uncheck to avoid having something you don't want installed.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
A little kindness from person to person is better than a vast love for all humankind.
~ Richard Dehmel