WiX— always overwrite the previous version
I have an installer of an application that needs to install over any existing version, regardless of version number. Instead, I've got an installer that constantly says that I need to go to add/remove programs. That's very frustrating behavior for my testers, since it just slows them down for no real reason in their minds-- the previous installer package would always just install, deleting any files that were previously there, so they never had to do that step. We also have a (large) customer base that's been similarly trained, in that whatever version I install right now should overwrite