If you do log in with your actual Sun NXT account, the company may detect the mod and permanently ban your account.
The modded APK is usually compressed (around 25-30 MB), making it easy to download even on slower connections. sun nxt mod apk v40121 vip premium unlocked full
This usually means the APK is corrupted, or you are trying to install a version designed for a newer Android OS. Try re-downloading from a different source. If you do log in with your actual