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.23.is.bokasteinn.nui_og_nia.obb'

4. Copy obb file to /SDCARD/Android/obb/is.bokasteinn.nui_og_nia/main.23.is.bokasteinn.nui_og_nia.obb