Newer Mac systems include a security setting that can block the installation of apps downloaded from places other than the Mac App Store. You should eject the disk image' or that the software 'is damaged and can't be opened. saying the software 'is damaged and can't be opened. If you are working on Mac OS X 10.9.2 or newer, you may see a message about a software installer being damaged when you try to launch it. What does it mean if a Mac installer says it 'is damaged and can't be opened'?