Due to unknown reasons, apps you had previously purchased can no longer be downloaded from the App Store or iTunes. However, it turns out these applications can still be accessed using iMazing's app downloading feature. This is because iMazing downloads apps using a different endpoint from what iTunes uses.
This app must be purchased on your Apple ID. You cannot just download any app ever made. Apple only lets you download apps you had bought or downloaded in the past.
- iMazing (Windows or Mac)
- Plist editor (ProperTree is free and cross platform, requires Python)