I found in xcode4.2, there is only ios5.0 & 4.3 simulator exist. My product should support ios4.0+. How can I install the ios4.0 simulator?
Thank you.

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Download
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_4__final/xcode_3.2.3_and_iphone_sdk_4__final.dmg
and install the packages you want on your Developer folder.
Here’s step by step on how to do it on Xcode 3.5 but it shouldn’t change much from Xcode 4
http://chris-fletcher.com/2010/08/28/howto-install-iphone-sdk-2-0-3-1-for-xcode-3-2/