osx installer: launchctl: Couldn't stat("/Library/LaunchDaemons/se.leap.bitmask-helper.plist"): No such file or directory
the osx installer fails on the pre-install script. it wrongly assumes that the plist for the bitmask-helper is already in the path (earlier versions of the installer would have put it there)
should check the existence of that file before trying to unload it.
(from redmine: created on 2016-03-04, closed on 2016-05-18)