Since these apps aren't on the modern App Store, you must "sideload" them. Sideloadly (Recommended for Windows/macOS): Download and install Sideloadly Connect your device and drag the file into the tool. Enter your Apple ID (used to sign the app for 7 days). On your device, go to Settings > General > Device Management to trust the developer profile. AltStore (Requires iOS 12.2+):