According to the vendor (https://rtsys.informatik.uni-kiel.de/confluence/display/KIELER/Downloads#Downloads-StandaloneApplications),
the quarantine attribute breaks the app and needs to be removed. To do so, install this cask with:
brew install --cask --no-quarantine kieler
WARNING: quarantining is a macOS security feature and you disable it at your own risk!
