If you have already used Android device, you may know the XAPK file, which contains all the game information on Android (including APK file and OBB file). Instead of the traditional installing option that you move the file APK into the folder with OBB, you can directly install XAPK. It will be very easy and limit the bugs.
1. Download XAPK Installer for Apkplay: Here
2. Install the APK file to your device.
3. After finish installing, you open the app. Then the app will automatically search all the APK files and XAPK files in your device. Everything will be shown very clearly.
4. You can install or delete any file you want.
Note: Not update!
You can install the game normally by adding the APK file into your folder with OBB (OBB installing instruction: Here)