There is no legitimate, official app called "iPhone 5 iOS 7 Emulator V2 APK." Searching for this specific phrase often leads to unreliable or unsafe third-party websites that may bundle malware.
: True iOS emulation is extremely difficult. While projects like TouchHLE exist to emulate very old iOS games (iOS 2.x and 3.x), they do not support 64-bit iOS apps or full system emulation like iOS 7. Safe Alternatives for iOS Experiences iphone 5 ios 7 emulator v2 apk