Why can't I install modded Gameloft APKs on the ZTE Blade V8 SE?

I have a ZTE V8 SE with android 7.0 Nougat, I have modded and official apks installed from different developers, the only ones that won't install are the GAMELOFT MODDED APK's (the gameloft originals can be installed)when I try to instal a gameloft mod apk it says: "app not installed the package conflicts with an existing package by the same name" (I don't have a copy of the app installed at all, not even other gameloft game) I tried changing the apk labels and names with apk editor and app cloner but after those procedures, even if I get to install the apk, it says the licence isn't valid and instantly closes. I wan't to install six gun modded cause the in-app purchases are honestly exaggerated, way too expensive and I only want to play it offline.

Hi Ethan. Have you enable Unknown Sources? If you haven't, go to Settings > Security > Unknown Sources. 

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