Old Iphone sdk versions

Does Apple offer any way 开发者_StackOverflow中文版to download previous versions of Iphone SDK? I don't want to target lower Iphone os versions but instead install an older sdk.

There are tons of links to previous iOS SDK versions at this page. Here they are, copied for posterity:

iPhone SDK 3.1.3 with XCode 3.1.4 for Leopard (10.5.7)

iPhone SDK 3.1.3 with XCode 3.2.1 for Snow Leopard (10.6.0)

iPhone SDK 3.2 Final with Xcode 3.2.2 for Snow Leopard (10.6.0)

Xcode 3.2.3 and iPhone SDK 4 GM seed for Snow Leopard (10.6.2)

Xcode 3.2.3 and iPhone SDK 4 Final for Snow Leopard (10.6.2)

Xcode 3.2.3 and iOS SDK 4.0.1 for Snow Leopard (10.6.4)

Xcode 3.2.3 and iOS SDK 4.0.2 for Snow Leopard (10.6.4)

Xcode 3.2.4 and iOS SDK 4.1 for Snow Leopard (10.6.4)

Xcode 3.2.5 and iOS SDK 4.2 GM for Snow Leopard (10.6.4)

Xcode 3.2.5 and iOS SDK 4.2 for Snow Leopard (10.6.4)

I don't know if it's bundled with all versions of XCode, but older versions of XCode (including 2.5 for Tiger) are all available. Check out this question.