Also try this if it still doesnt work
1- Download OBB files or DATA files and extract files zip
2- Download mod APK
3- Move OBB Files (con.xxx folder) to Android/OBB folder in your device
- Or move Data files (com.xxx folder) to Android/data folder in your device
4- Install mod APK
5- Enjoy
Please check storage permission and overlay permission for that app if you have Android 6 or higher. U need turn on it