Xcode 4.2 Snow Leopard Doesn't Install
Just change date to January 2012 or something, it will install just fine. The certificate expired in March.
Updated, steps:
- turn off automatic synchronization of date & time
- change actual date of the system to 01.01.2012 (for example, prior to 26.03.2012)
- install the Xcode
- turn the automatic synchronization back on.
got similar problem here with 10.6 + combo update installed.
after runing software update and installing something called "apple installer update" (com.apple.pkg.update.softwareinstallerupdate.1.0), xcode installer works just fine.