Cause: You are trying to install a 32-bit app on an iOS 11+ device.
Solution: iOS 11 dropped 32-bit support. You cannot run Minecraft 1.1.5 on iPhone 7 or newer (unless you use a compatibility layer like touchHLE on PC, but that's emulation). You need an iPhone 5 or older, or iPad 4 or older.
Why would a modern player seek out an old version of Minecraft, such as a theoretical 1.1.x IPA? The answer lies in "Nostalgia Gaming" and hardware obsolescence.
Modern Minecraft (currently on versions 1.20+) is a resource-intensive game requiring constant internet connectivity and powerful hardware. It is bloated with features that some veteran players find unnecessary. For these players, versions around the 1.0–1.1 era represent a "Golden Age" of mobile Minecraft. It was a time when the game was transitioning from a simplified mobile port to a fully-fledged version of the main game, yet still retained a simple, blocky charm.
Furthermore, there is a practical element to the demand for IPAs of this era. Older iPads and iPhones are often repurposed for children or as secondary devices. These devices cannot support the latest iOS updates, and consequently, they cannot download the latest version of Minecraft from the App Store. The only way to play Minecraft on a 10-year-old iPad is to find an IPA file of a version that was compatible with that era's iOS firmware. Minecraft 1.1.5 Ipa
It’s a fair question. With Minecraft Bedrock 1.20 available, why downgrade?
1. Download AltStore Go to altstore.io and download the version for your OS. Install it. You will see a new icon in your menu bar/system tray.
2. Install Mail Plugin (Mac only) Open Mail app, go to Preferences -> General -> Manage Plug-ins. Enable AltPlugin. Restart Mail. Cause: You are trying to install a 32-bit
3. Connect your iPhone/iPad Connect your device. Ensure Wi-Fi syncing is off (USB is more stable for first install).
4. Install AltStore to your device In the AltStore menu bar icon, click "Install AltStore" and select your device. Enter your Apple ID (it uses your ID to sign the app; this is safe and local).
5. Transfer the IPA
6. Trust the Profile Go to Settings -> General -> VPN & Device Management -> Tap your Apple ID -> Trust "AltStore" and "Minecraft."
Note: Free Apple IDs expire after 7 days. You must refresh Minecraft via AltStore (connected to PC) every week. A Developer account ($99/year) gives 1-year expiry.