Devices like Moto G that runs on 4.4.2 don't have any file explorer so you can't install anything on it before getting an internet connection on those devices so this tutorial will show you how to install them
1.Download Mobile GO for here -> http://www.wondershare.com/android-manager/
2.Install it in PC
3.Go to your phone -> Settings -> About Phone -> and tap 10 times on "build number" you will get a message saying "you are now a developer"
4.Now you will see a new opt on Settings called "Devoloper Options"
4. Devoloper Options -> And check USB Debugging
5. Connect your phone to PC
6. Open Mobile Go
7. Let it connect to your phone
8. Open Google Play and Download any File Manager like ES File Explorer etc
9. Install it
10. Now you got a file manager so you can just copy apks in your phone and open that place and tap and install that app
HIT THANKS IF IT HELPED