Apple has removed the Appstore/App sync from iTunes 12.7 you may no longer put old version of DJI Go/Go 4 to your new/restoring ios device anymore.
After reading further, looks like this will impact people who update their iOs devices to iOS 11 when it's released as iOS 11 needs the newer version of iTunes.... ie don't update your devices to iOS 11 if you want to keep the App Store features in iTunes on your desktop computer.
Thanks for the update. Have you tried the new method?If you can, backup your entire mac using timemachine. Install Ei Captain. The iTunes bundled with Ei Captain is a good one. From that point you may ask Mr.Youtube for help to retrieve required ipa from Apple Appstore. Save them well. Then reinstall entire mac from the Time Machine backup. It is ok to use iTunes 12.7 Apple provides Configurator Assistant 2, free Mac software that you can get from Mac Appstore, to install ios app from ipa or online iTunes Appstore. It works with ios 10.3.3 and ios 11,
Do you mean the Apple Configurator 2? Yes, I did. I have to backup whatever version of ios app from old iTunes (Music>iTunes>iTunesMedia>Mobile Application), though may not necessary because installing the 12.7 will not harm the Mobile Application folder. Then to install the ios application from hard drive, launch the configurator, sign in with your Apple account, plug the iDevice to mac, let Configurator see the device, click to select the device, click Add button, select whether to install from iTune Appstore or from your mac, select from mac, select ipa file that you want, let the installation proceed until finish, then you are good to go. The ios application file, the ipa, must be prepurchased using your account otherwise when you run the app on the device ios will ask you to enter the apple id and password that own the ipa file.Thanks for the update. Have you tried the new method?
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