Download the Android version from google drive here. Works on devices on Android 6.1.0 and up.
Once the download has finished open "WordFest Demo.apk" via your file browser or your nitifercations.
Once you have opened the installer just click INSTALL. If you have never installed an APK before you may have to enable it in security settings, your device will lead you threw that.
Once it has finished installing just tap OPEN.