I had the same issue with third-party APKs, including Shadow Fight 2. I fixed it by enabling installations from unknown sources in my device settings. This allowed me to install and play Shadow Fight 2 APK  without any problems.

Thank You very much for this helpful information about this issue. This question is irritating me for a long time but thank god, after reading this information, now i can easily come to result. I recommend you to download shadow fight 2 apk.