If your device is on iOS 15.0 (as your file name suggests), you are in luck. You can use TrollStore to install the IPA permanently without ever needing to resign it. 3. A Note on Compatibility
Sites like Decrypt.day or ARMConverter often host versions that are compatible with specific OS versions (like your OS 15.0 requirement). 2. Using Sideloading Tools
The most straightforward way. Plug in your phone, drag the IPA into the tool, and enter your Apple ID to sign it. If your device is on iOS 15
Always be cautious when downloading IPAs from "hidden" or unofficial sources. These files can theoretically be modified. If you have a Mac or a PC, you can use via the command line to try and download the app directly from your own App Store "Purchased" history if you ever owned it in the past.
Great if you want to keep the app active without a computer, though it requires a bit more setup. A Note on Compatibility Sites like Decrypt
Are you planning to install this on a device or a stock iOS 15.0 phone?
Search for "iOS IPA Collection" or "Weather Bot IPA." Many users upload bulk libraries of decrypted apps here. Plug in your phone, drag the IPA into
Getting your hands on specific, older versions of iOS applications—like the (BFI2) IPA you're looking for—usually requires accessing specialized community archives or using legacy tools to pull them from the App Store servers. 1. Check Community Archives