Select the downloaded zip file ( neon64-1.49.0.zip ) from your storage.
Before downloading anything, ensure your device actually requires the ARMV8 NEON file. MX Player can automatically tell you what it needs. Open on your Android device. mx player custom codec 149 0 armv8 neon
MX Player will restart automatically. If the codec is compatible, you will see a notification saying Troubleshooting Common Issues Select the downloaded zip file ( neon64-1