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According to this helpful article, I should be able to extract notarytool for use on macOS 10.15 and later. I've extracted notarytool and put it in a common location for use with a script that builds, signs, and notarizes plugin installers. The script previously relied on altool. The initial call to notarytool is: xcrun <path to notarytool> submit --apple-id <our id> --password <our password> --team-id <our ID> --wait <path to file> This works fine on a machine running macOS 13.5.1, with Xcode 14.3 installed. The installers get built and notarized. However, on a machine running macOS 11.4, with Xcode 12 installed, I get this error: xcrun: error: unable execute utility <path to notarytool> because it requires a newer version of macOS. OK, I tried removing the initial xcrun command, and now I get this error: dyld: Library not loaded: /usr/lib/swift/libswift_Concurrency.dylib Referenced from: <path to notarytool> Reason: image not found The article linked above makes it sound like notarytool should work as a standalone tool from any machine running macOS 10.15 or higher. Is the existing Xcode installation interfering? Is there an OS/Xcode version agnostic way to run notarytool?