when avast updates, how to skip google chrome installation and cleaning problem?

The sequence of facts I regret and showing why I ask you guys … how to avoid Google Chrome install and messleft:

Avast makes the favor to ask to update … i say all right (I would even click on a “Thank you” icon)

It updates … and then it appears that I have a new browser I didn’t ask for (Yep … Google Chrome)

I erase it through the control panel and …

Avast tells me that the browser I didn’t want G,Chrome… had not been quite well erased

Avast ask’s me if I want to buy an upgraded Avast that can clean all the mess the uninstallation of Google Chrom left

I got no money … what I have left is to ask you

How to prevent Avast updates to install Google Chrome again, without notifying me?

Thank you so much