Squirrel doesn’t have any installation gui or specific process. It downloads and installs version N+1 in the background. Next start will run that version. Any decision to show even a notification that this happened is entirely up to the developer. I think it’s even near impossible to show an “installer” in the traditional sense for the initial install. You can show a splash at initial install that’s it. As far as userland installers go they are all (almost by definition) the same in the end