To download the route, you would need to download Google Earth. All links are available above. On your Android phone or tablet, open the Google Earth app Google Earth. Tap Menu Menu and then Projects Projects. At the top, tap Open. To add a file directly from your device, tap Import KML File. To select a file from your Google Drive or a shared file, tap Open project from Drive. Tap the file you want to add. To return to the map and open the file, tap Back Back.
For more information or help, visit Google Earth Help on how to Import a KML map data into Google Earth