Hello,
I have exactly the same problem with the latest 2 versions of the 16 SDK.
I can install the IPA on all my devices ( iPhone 3gs, iPad Retina etc... ) but not on the first generation iPad 1.
This has to do with the 64bit support I guess? It should still be possible to install on a device running iOS 5.1.1 though, so there must be something wrong.
Any ideas Adobe Team?