APK not Installed Help

Hello all, ive just rooted my Samsung Note4 and I can tell you its been very hard to do but its all sorted now, my only issue is that when I try and install Showbox APK it comes up with App not installed the package appears to be corrupt, the APK is not corrupt as I have put the same one on my S5, and had this one on this phone before I rooted it,, ive tried zipsigner and apk editor and both have failed top install the apk ,, so it must be something to do with the root,, any help please...

APK not Installed Help

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