1. Download APK first, then copy to your Android device's SD card

2. Install APK, DO NOT open app

3. Download obb files, then rename to 'main.30.kr.co.angames.astronest2.google.android.obb'

4. Copy obb file to /SDCARD/Android/obb/kr.co.angames.astronest2.google.android/main.30.kr.co.angames.astronest2.google.android.obb