After you re-FTP, if the problem persists, in install.php find:
Code:
include $relative_script_path.'/includes/config.php';
include $relative_script_path.'/libs/auth.php';
And replace with:
Code:
echo "A";
include $relative_script_path.'/includes/config.php';
echo "B";
include $relative_script_path.'/libs/auth.php';
echo "C";
What letters print onscreen when you call install.php from your browser?