iOS Update Says the App Is No Longer Available

If updating the iOS version of OrangeGo says This item is no longer available, the app is not in the App Store for the region of your current Apple ID.

• Uninstall OrangeGo;
• Switch to an Apple ID in a region where OrangeGo is available;
• Search for OrangeGo in the App Store and reinstall it.

Note: switching Apple IDs does not affect your OrangeGo account or plan.