I'm sorry buy AppZapper is a rip-off. AppTrap does exactly the same thing for free, while CleanApp is cheaper and does far more than AppZapper, including logging installs to actually delete _everything_, archiving uninstalled apps, removing preference panes and widgets, and deleting useless portions of universal binaries. Given the alternatives out there, this app's developer needs to lower the price or add some features or there's simply no point to it.