Not happy!
I had 7.0.1451 installed. In my Update settings I have 'Ask when an update is available' checked under Programs, and 'Ask for reboot when needed' checked under Update Options.
In my absence Avast updated automatically to 7.0.1456, AND installed the dreaded Google Chrome, which I categorically do not want. (As an aside, Chrome should be opt-in, not opt-out).
So I uninstalled Chrome and rebooted, and Avast repeated the automatic program update AND installed Chrome AGAIN!
After a second Chrome uninstall and an hour of my time wasted, all now seems to be OK. But I am NOT impressed.