great, so we are making progress.
Can you check again please that you installed the complete folder with all of its content in the right directory? The complete path looks like this under Lion with Xcode 4.3:
/Users/<yourname>/Library/Application Support/iPhone Simulator/5.0/Applications/Issue Previewer for iOS Simulator/
(and in there are four files/folders, namely Documents, Library, myKiosk-Quark and tmp)
And then launch iOS Simulator, switch it to iPad, quit and launch again (sometimes apps only register the second time you launch).
Does it still not display?
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