How do I manually install an app in iTunes 12.7?

I foolishly installed iTunes 12.7, and now find that I am unable to install a development/QA version of my company's app for testing. After downloading the IPA, I am following the steps found on Apple's support page, under "Manually add items from your computer."

There, I'm told to drag the IPA file to the iTunes sidebar, like so:

But when I do exactly that, it tries to create a shortcut, and fails (the section of the sidebar blinks several times):

This is in iTunes 12.7, to an iPad mini 4, iOS 10.3.3. Manual management is enabled:

Solution 1:

Have you tried the Apple Configurator 2?

I just read about it here, but haven't actually tried it myself: How do I download an iOS App (IPA) file to my Mac after iTunes 12.7 update?

Here's a description from the above link: http://krypted.com/apple-configurator/upgrade-devices-and-apps-using-apple-configurator-2/

Solution 2:

you're dragging into the wrong place, click on the phone icon on top and then drag it under "On My Device"

Solution 3:

You can download an older version of iTunes from Apple Here

Solution 4:

I dont know if you're familiar with Cydia Impactor. If you're not, Cydia Impactor is a software that allows you to put any IPA inside of any Apple device (iPhone or iPad). Of course you need an Apple ID to do so.

There are plenty of videos on the internet that shows you how to do so. But if you need any help feel free to ask anything.

I hope it helps :)