An IPA file is the executable package format used by Apple for iOS applications. To install an app that is no longer on the App Store, you must "sideload" this file onto your iPhone or iPad.
This scarcity created a black market. If you want FIFA 14 on a modern iPhone, you don't search the App Store. You search for "FIFA 14 IPA file cracked."
The Ultimate Guide to FIFA 14 iOS: History, IPA Files, and Preservation
AltStore acts as an alternative app store on your phone but requires a computer to refresh the app certificates every seven days. Install on your PC or Mac.
: The game is no longer available for official download on the Offline Playability
This article is for educational and historical preservation purposes only. Downloading copyrighted software via unauthorized third-party channels violates terms of service and intellectual property laws. To help you get this running safely, let me know: What specific model of iPhone or iPad do you plan to use? What iOS version is currently installed on that device?