Using custom install would have made avoiding anything you didn't want very easy.
The OP reported having used the custom install.
Avast has installed safezone browser on my computer without my approval, even though it was unticked during custom installation.
So there appears to be something else going on, what that might be I have no idea. I have never received any avast module which I have unchecked in a custom install. I do uncheck most modules/components other than the shields and software updater, image of last time I used the custom install.