1) download latest version of Drupal, e.g., drupal-6.16.tar.gz from www.drupal.com
2) FTP the file to the folder (e.g., www.mysite.com.au/) in web server, which is the root directory of future web site
3) create simple php file callled run.php with the following content:
<?
echo exec('tar -zxvf drupal-6.16.tar.gz');
?>
4) open a www.mysite.com.au/run.php
a folder c www.mysite.com.au/drupal-6.16/ will be created
5) move all files under drupal-6.16 to top directory, then delete empty folder drupal-6.16