Since the official App Store is a difficult neighborhood for legacy users, the community has built its own archives.
Always look for IPAs labeled (iOS 7) or (armv7) . Avoid those with arm64 only unless you have an iPhone 5 or iPad 4 (which do support arm64 on iOS 7.1.2). ipa files for ios 712
There are three legitimate (and one grey-area) ways to obtain IPAs that run on iOS 7.1.2. Since the official App Store is a difficult