Downloading Neutron (or its unlocker) from third-party sites (rather than the official Play Store) carries distinct risks:
Neutron Music Player Pro is a high-performance, audiophile-grade music player known for its proprietary Neutron HiFi™ 32/64-bit audio engine neutron music player pro apk top
Neutron. Winner for Usability: Poweramp. Downloading Neutron (or its unlocker) from third-party sites