I have had Avast installed over a year and always use the manual updates.
On the Maintenance tab there is a button marked "Update Program" I clicked this (as I have done many times in the past) and a download started. No pop ups, no options, no questioning if I wanted the damn thing on my computer, just a down load that took forever. After a reboot (as requested) Lo and behold I had GOOGLE CHROME.
If that isn't a sneak install, please tell me what that is.
As expected no replies to my emails to date!!!!!
By the way Jan if you are anything to do with avast, you may want to pass on to your management that their customer service is appalling and inflates a small annoyance into a major complaint.