I’ve just got a nice alert, while trying to install a Mac App from the AppStore, saying the following:
"A newer version of this app is already installed on this computer."
- Nuke the app’s Xcode build folder.
- Execute the following command:
/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user
Now you should be good to go!