In the case of my company's software it's for ease of deployment for new versions. When you click download you get a gui that will step you settings etc. I don'

In the case of my company's software it's for ease of deployment for new versions. When you click download you get a gui that will step you settings etc. I don't want to rebuild and re-sign the gui every time I have a patch and need to change its install behavior slightly, so it downloads the latest installer dll and executes that in order to handle any new flags, configs, added binaries, etc. All of this is done behind the scenes though, so your average end user doesn't even notice.