Scammers use version numbers like "V2" or "Pro" or "Gold Edition" to imply legitimacy. In reality, if you download three different "iPhone 5 iOS 7 Emulator V2 APK" files from three different sites, you will get three completely different apps—none of which will actually run iOS apps. The "V2" is purely psychological marketing. No open-source project or reputable developer has ever released such an emulator because it is legally and technically unfeasible.