CCleaner v1.16.573 refuses to launch in Mac OS X 10.7.5. When I double-click on the icon it makes the opening animation but nothing ever happens after then. Removing it with AppCleaner, restarting, and reinstalling didn't help. I had to downgrade back to v1.15.507 to get it to work. If CCleaner v.1.16 no longer supports older versions of Mac OS, then please update your web site where it states "Requires an Apple Mac running 64-bit macOS 10.6 to 10.14 Mojave".