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Photoshop CS5 download file won't install in Mac -- "“Install.app” is damaged and can’t be opened. You should eject the disk image."
When attempting to install downloaded Photoshop_12_LS1.dmg, an error message "“Install.app” is damaged and can’t be opened. You should eject the disk image." This has occurred over multiple downloads of the dmg. How to fix that, please?