Do not expect a sleek, modern Material You design. QSP Player looks exactly like what it is: a utility wrapper for a Windows-era engine.
If a player crashes on launch due to storage asserts, you can try to "downgrade" its storage view using ADB commands (requires a PC and USB debugging). This is not recommended for average users, but advanced users can research: adb shell appops set <package_name> android:legacy_storage allow. qsp player android 11
QSP Player isn’t available on Google Play anymore. You’ll need to sideload the APK. On Android 11, this requires granting “Install unknown apps” permission to your browser or file manager — a simple but often overlooked step. Do not expect a sleek, modern Material You design