These packages contain GitLab and all its dependencies (Ruby, PostgreSQL, Redis, Nginx, Unicorn, etc.).
They are made with <ahref="https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/README.md">omnibus-gitlab</a> that also contains the installation instructions.
GitLab.com subscribers can download GitLab Enterprise Edition packages via the [subscriber area](https://gitlab.com/subscribers/gitlab-ee/blob/master/doc/install/packages.md).