Debian Edu is available for download in two variants.USB/DVD image - Full offline installation CD image - Base system with online installation
Alternatively, please see the official download site for more options and detailed information on how to use these downloads for installation.
With the above images, all profiles of the Skolelinux system can be installed. It is encouraged to always have a working full installation image handy on USB or DVD media in case important installations need to be done with unreliable internet connection.
Detailed instructions on how to install and configure Debian Edu can be found in the official handbook