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I've download Xcode 4.2 from official site. And when installation starts - it shows an error:
Not very informative.. What is the problem? where to see logs or something?
PS.I have: Mac OS 10.6.8, Xcode 4.0, ~10 GB free space. And I want just to test my app on ios5.
UPDATED:
Installer[51580]: Failed install preflight: Error Domain=PKInstallErrorDomain Code=102 UserInfo=0x119de62e0 "The package “OpenGLApps.pkg” is untrusted." Underlying Error=(Error Domain=NSOSStatusErrorDomain Code=-2147409654 UserInfo=0x119df06b0 "The operation couldn’t be completed. CSSMERR_TP_CERT_EXPIRED")
You can try changing your system date to a date before 26 March 2012. For details, check https://apple.stackexchange.com/questions/45841/xcode-4-2-snow-leopard-doesnt-install