- Open iOS Simulator.
- Switch to iOS 6 by choosing Hardware > Version > 6.0
- Tap and hold the iAd tester icon until it jiggles.
- Tap the "x" in the upper-left corner of the icon to delete iAd Tester
- iAd Tester will now install properly in iOS 6 Simulator.
Repeat the process for iOS 6.1
- Open iOS Simulator.
- Switch to iOS 6 by choosing Hardware > Version > 6.1
- Tap and hold the iAd tester icon until it jiggles.
- Tap the "x" in the upper-left corner of the icon to delete iAd Tester
- iAd Tester will now install properly in iOS 6 Simulator.