Most updates come as a .zip or .apk file. To run Half-Life, you typically need to copy the valve folder from your purchased Steam copy into a folder named xash on your device.
For the most up-to-date (though potentially less stable) versions, check the Xash3D FWGS Continuous Builds . Download xash3d update link here redme zip
If you are specifically looking for the Android version, the xash3d-android-project Releases often point toward the engine assets. Installation Highlights Most updates come as a