Install Simulator SDK 4.3 to Xcode 4.4 on Mountain Lion

I've looked into it, and this is a deliberate behavior from Apple.

Here is an (edited) extract of the cache for Xcode download locations:

~/Library/Caches/com.apple.dt.Xcode/Downloads/eded78df8bfabaf6560841d10cf8e53766f74f28.dvtdownloadableindex

<dict>    <key>source</key>    <string>http://adcdownload.apple.com/ios/ios_simulator__resigned/ios_43_simulator.dmg</string>    <key>identifier</key>    <string>Xcode.SDK.iPhoneSimulator.4.3</string>    <key>name</key>    <string>iOS 4.3 Simulator</string>    <key>userInfo</key>    <dict>        <key>InstalledIfAllPathsArePresent</key>        <array>            <string>$(DEVELOPER)/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk</string>        </array>        <key>ActivationPredicate</key>        <string>$MAC_OS_X_VERSION < "10.8.0"</string>    </dict></dict>

Note the explicit "ActivationPredicate: $MAC_OS_X_VERSION < 10.8.0" setting, which is not present on other simulator packages.

I tried to edit the file, but it is replaced by another version as soon as Xcode opens. And I couldn't manage a manual download of the 4.3 Simulator DMG: the ADG website throws a "Session expired" error.

Looks like Apple had issues with the 4.3 simulator, and decided to disable it. Which sucks for people that have to support this version.

I filed a DTS with Apple and confirmed with them that iOS4 simulator is not supported on Mountain Lion. They recommend to test on a real device.

It looks like a Lion vs Mountain Lion issue.
I updated several machines to Xcode 4.4 today. The two older Lion systems offer to install the iOS 4.3 and 5.0 simulators under xcode|preferences|downloads. The newer Mountain Lion system only offers the iOS 5.0 simulator.