It seems that the error is related to an expired certificate covering part of the iOS package. I assume that you only need 3.2.6 to create universal binaries that support earlier versions of PPC, as well as Intel Macs? In this case, you can simply refuse the second license agreement covering iOS. Then the installer should proceed with installing only Mac-related tools and SDKs.
Update: I see that you were referring to 3.2.3 when I meant 3.2.6. I'm not sure that the installer works the same way, but imagine that you still want 3.2.6?
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