With Apps option removed from latest iTunes 12.7.... , how to install adhoc IPA?

Now that after latest update from Apple for iTunes, Apps option is removed from Library in iTunes.

See Article Here: https://support.apple.com/en-us/HT208075

How should my client, now get the ad hoc IPA, installed to his iPhone. Do the developers now need to deliver through TestFlight beta testing only?

You can still install ad-hoc apps using iTunes by following the steps under Manually add items from your computer in this tech note

The steps are:

1. Connect your device to your computer and open iTunes
2. Find your device in the left sidebar in iTunes
3. Drag your ad-hoc IPA to the device
4. Once the device listing outlines in blue, release the file.

Apple Configurator 2 software from Apple can be used for sideloading - https://itunes.apple.com/us/app/apple-configurator-2/id1037126344?mt=12

Just install the software, connect your device, drag your ipa into the Configurator, as simple as that.

Open Xcode and go to Window Option and select DevicesAndSimulators.

Select your device. and click on "+" icon from the bottom.

click on + button will open window to select you ipa from system.

Happy Coding

Follow these steps to install an ipa file