Log into your Gandi handle that owns the Simple Hosting instance.
Activate and access your Simple Hosting instance's SSH console.
Navigate to the vhost:
$ cd web/vhosts/www.example.com/
Go to the downloads page on Drupal's website and copy the location of the archive. (For 7.37, this is http://ftp.drupal.org/files/projects/drupal-7.37.zip )
Download the archive:
$ wget http://ftp.drupal.org/files/projects/drupal-X.X.zip
Uncompress the archive:
$ unzip drupal-X.X.zip
Rename the folder that was created from this decompression:
$ mv drupal-X.X drupal