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I have the same problem, and am getting the exact same error message. I prefer to stick with Sierra 10.12.6, for a variety of reasons. So, I figured I'd download and reinstall XCode 9.2, which is the version that is best calibrated to my computer's operating system.However, when I download Xcode_9.2.xip, I can't even open it: ArchiveUtility informs me that it is not an Apple product (note: I downloaded it from the Apple Developer "more downloads" site). I am stymied. I am using a MacBook Pro, 9,1. 2.6 GHz Intel Core i7, 1TB Solid State hard drive, 16GB RAM.All ideas will be greatly appreciated.