For a safe download, use the official Khan804 website or verified app source rather than an unknown APK website. I don’t have a verified Khan804 download link from the information provided, so I wouldn’t want to invent one.
Basic Android steps:
- Open the verified Khan804 source.
- Tap Download APK if an official APK is provided.
- Wait for the file to download.
- Open the APK and follow Android’s installation instructions.
- Launch the app after installation and register or log in.