Here's how:
- Grab the libimobiledevice binary for Mac OS X from my github account at https://github.com/benvium/libimobiledevice-macosx/zipball/master
- Follow the install instructions here:
https://github.com/benvium/libimobiledevice-macosx/blob/master/README.md
Now connect your iDevice, open Terminal.app and type:
ideviceinstaller -i myApp.ipa
Note: Your IPA will need to have a valid code signature and mobileprovision file for the install to succed. This system is NOT a way around iOSs security!