The ISO is available on http://my.denyall.com space. Section Tech Support > Download.
It can be burned on a CD-ROM or can be used directly in a virtual machine to install the WAF.
During the device start-up, boot on the CD-ROM or the ISO. Then on the boot menu, select the first option and run the installation (Enter).
The installation can take few minutes. At the end of the installation, it will be asked to eject the CD-ROM (or ISO) and to press a key to reboot the appliance.
Once the system installed and rebooted, the next step is to configure the appliance mode: Management or Managed