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Just updated Catalina to 15.1, kind of wish I had stuck with Mohave. Now XCode, v11 I think, won't run, chokes on installing components. Looks like there's a problem with the file MobileDevice.pkg:Generic message for error: Error Domain=PKInstallErrorDomain Code=102 "The package “MobileDevice.pkg” is untrusted."andUserInfo={SecTrustResult=5, PKTrustLevel=PKTrustLevelExpiredCertificate, NSLocalizedFailureReason=CSSMERR_TP_CERT_EXPIRED}I tried to download 11.2 and reinstall but after close to an hour the download finished and complained it couldn't install just now.Anyone have any insight / suggestions?