I deleted the Xcode file in the applications folder and empty the trash. I never uninstalled it properly. Now I’d like to reinstall it but there is an unknown error during installation. Is there any way to fix it to install Xcode properly?
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(Assuming Xcode 4.2 or below)
Set your system time to 1st January 2012 or earlier (but not too early), as the certificate that signed the package has expired.