Hello Unfortunately, the page lists Debian Wheezy 7.8 links instead of 7.9 links. https://www.debian.org/releases/wheezy/debian-installer/ The iso images are already on place. Example: http://cdimage.debian.org/cdimage/archive/7.9.0/amd64/iso-cd/
Regards. Andre Felipe http://www.techforce.com.br
