Downloading Battle of Helicopters: Gunship Strike 2.18
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.218.com.extremedevelopers.battleofhelicopters.obb'
4. Copy obb file to /SDCARD/Android/obb/com.extremedevelopers.battleofhelicopters/main.218.com.extremedevelopers.battleofhelicopters.obb