The code of NAV Download is more concise with:

public static int update() throws Exception {

        InputStream is = (new WebConversation()).getResponse(new GetMethodWebRequest(URL)).getTableStartingWith("Filename").getTableCell(1,0).getLinks()[0].click().getInputStream();

        drain(is, new BufferedOutputStream(new FileOutputStream(new File(FILE))));

        return execSync(INSTALL);

    }

However is this desirable?