GPL-detail

[JurgenG]

This is really a detail, but in the license.txt file, I'm reading:

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

I don't think a copy of the GPL is delivered along with this code.
Furthermore, what GPL-version is it distributed under? I'm assuming GPL v3+ (like Chamilo) but I'm not certain as Prestashop has its owns different license.