Last fall’s release of iTunes 12.7 disappointed a lot of people with the abruptness of change. The most notable one was removing the ability for iTunes to handle backing up iOS apps and syncing them directly. Henceforth, you have to use internet-based retrieval of yours app for a new iOS device or after a wipe and restore.
However, there’s still a way to add apps manually, though Apple doesn’t make it easy. Macworld reader Kate wrote in asking about how to get a few apps, including sticker packs, that were no longer being distributed on the App Store, and thus couldn’t be restored as a previous purchase.