How do I downgrade Xcode?

I am trying downg开发者_运维知识库rade my latest installed Xcode 3.2.5 to older versions(3.1.x etc). Otherwise i'm unable to use iPad 3.2 simulator, iPhone 4.0 simulator and all in Xcode, eventhough i changed the deployment target to 3.2, 4.0 etc., which causes some issues to test really on these simulators. I also really want to know how do i uninstall existing latest Xcode and install some older Xcode versions which supported by Mac. I searched google, didn't find suitable answer for downgrading Xcode versions. Could someone please guide me how do i do that?

Thank you.

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You should be able to install different versions side-by-side by installing it in a different directly. I use /Developer-v.x for older or beta versions. If you really want to get rid of your old one, you'll have to delete the /Developer directory and re-install your target version in that directory.

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Follow the instructions in /Developer/About XCode and iOS SDK.pdf, in the section titled "Uninstalling Xcode Developer Tools". Then install the XCode version you want. For more gory details of XCode installation, see the apple docs.