Apps, even after being removed from the Launchpad or Applications sidebar in Finder, do leave preferences and other files scattered around. Where are they, typically, and how does one find them?
Forget the complex or manual steps, or costly tools to get screen shots scaled down from a retina display. I have a shell script that triggers an interactive window screen capture, saves the screen shot (assumed to be 2x retina display), re-sizes it to 1x and compresses the PNG further! Best of all, it does not require paid software or Automator.