1. Tap Android APK above to download it.
2. Open the downloaded file. If Android says the browser can't install apps, tap Settings and allow it, then go back.
3. Play Protect may say the app "isn't recognised" and show only Cancel — tap More details, then Install anyway.
4. Open EPHIX PULSE from your app drawer.

Both warnings are normal for any app installed outside the Play Store — this is the real, signed app, Play Protect just doesn't recognise it yet. It's safe to install, and you can switch the browser's permission back off afterwards.