I have an IPA signed for ad-hoc distribution. I can install it fine with Xcode Organizer by dragging it to the device. It also worked with iTunes <=10 by dragging onto th
For iTunes 11 and above version:
open your iTunes "Side Bar" by going to View -> Show Side Bar drag the mobileprovision and ipa files to your iTunes "Apps" under LIBRARY Then click on your device. open you device Apps from DEVICES and click install for the application and wait for iTunes to sync
For iTunes 11:
For osX Mavericks Users you can install the ipa-file with the Apple Configurator. (Instead of the iPhone configuration utility, which crashes on OSX 10.9)
for iTunes 12 and above (Yosemite) double click on IPA then browse your iOS device, on applist you will see the app, click the install on item.
I always use the iPhone configuration utility for this. Allows much more control and is faster - you don't have to sync the whole device.
For iTunes 12, drag the .ipa file from the Finder to the Apps area NOT inside your device (in iTunes)... alternately, you can just double click on the .ipa in the Finder.
Important note: you have to change Version and/or Build number. Otherwise, you get no notice from iTunes at all...
Then switch to your device in iTunes, and install or update the application.
Then hit sync.