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If it says something like "Shards_of_God_v1.2 is damaged and can't be opened. You should eject the disk image", then that's bs and a pretty sleazy move on Apple's part - the file isn't "damaged", it just doesn't have an app store license. I don't know why you can't open the readme though, that's strange - will ask the person who made the package and get back to you.