One thing I do not like, is if the update is done by the GUI, the program likes to install all the new features, like Safe Zone, etc.
Some people do not want all the extras, just the basic antivirus protection. There is no reason the program should not just update what is already installed and offer a choice of wether or not to install additional components. The other way is to run the Offline installer and select customize to select what you want or not. But this is more time consuming and confusing for the average user.