[@John USA] Keep in mind that many of us don’t want the default installation choices. We might want to install to other than C: drive, might need a different language pack, might not want the program to take over all the possible file associations it knows about, and might not want it to install extras we won’t use. I’d guess about 90% of the time, when I update a program, it already knows my settings from the previous install. But the other 10% that don’t, well, an upgrade leads to dual installations and all the other problems above. Even if a program finds my old settings, it may be offering new features I don’t need. I won’t even get into the big leap of faith in trusting a program to get the correct, newer, official version. And for people who frequent this site, many of our programs cannot be updated without losing the license, leaving us with a trial program. Would an automated installer understand that?
So any program that offers to install things automatically is, for me, something to avoid. The fact that SUMo does not, is probably the best thing I can say about it.