como isntalar parche de half life 2 para half life 1

links part 1http://www.mediafire.com/?sw37fw55y6yy3bz part 2 http://www.mediafire.com/?837j1jdv17bj9v5 part 3 http://www.mediafire.com/?p4mtre0iie39r2r part 4 http://www.mediafire.com/?d74xwvsirh26d51 y los modelos alternativos http://www.mediafire.com/?pdxd4m3pglfs4ol