Step 4. Click App Library, here you can see all the apps you have downloaded. If you want to install old version of app after updating. Choose the one in App Library, click Install to Device, the old version of app will start to download to your iPhone, iPad or iPod touch. Newer versions of iTunes did away with iDevice app support. So, you need to download and use an older of iTunes ( iTunes 12.6.5 or earlier ) so you can download current iOS Apps to iTunes, from the iOS App Store through iTunes, before you can attempt to download older versions of apps from your older iPad using the iOS App Store on that older iPad.
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