Running Mac Sierra 10.12.4. Photoshop CC was not launching, so uninstalled Photoshop and then installed Photoshop CC 2017. App did not launch from "Open" button. Double-clicking on app resulted in error message "You can't open the application 'Adobe Photoshop CC 2017' because it is not responding". Uninstalled and installed again (twice) resulting in same error message.