Download Koha
To add the Koha Community repository to install the current stable release of Koha, add the line
deb http://debian.koha-community.org/koha stable main
to /etc/apt/sources.list.
For complete instructions on how to use the Koha packages, including how to install the development or previous stable versions of Koha, see https://wiki.koha-community.org/wiki/Debian.
If you are sure you want a tarball, you can download the koha-latest.tar.gz, or the alpha/beta versions from the list below.