Use APKPure App
Get School Schedule Deluxe Retro old version APK for Android
일정 디럭스 - 학교와 연구 모두를위한 최고의 도우미.
Schedule Deluxe - the ultimate helper for school and study.
This is a compatibility version for older android devices.
If your device is running android 4 or higher, you better use the following version:
https://play.google.com/store/apps/details?id=com.tobiasschuerg.stundenplan