Ansible Tower is a licensed tool. However, it can be used to manage, at most, 10 servers using a free license. The Tower setup can be downloaded from Ansible's official website (https://www.ansible.com/products/tower). Once the compressed tar archive is obtained, then we can install Ansible Tower. It should not come as surprise that we have to use Ansible for installing Ansible Tower.
Another point to note is that Ansible Tower is only supported for the following operating systems:
- Red Hat Enterprise Linux 6 64-bit
- Red Hat Enterprise Linux 7 64-bit
- CentOS 6 64-bit
- CentOS 7 64-bit
- Ubuntu 12.04 LTS 64-bit
- Ubuntu 14.04 LTS 64-bit
More detailed requirements can be found inside Ansible Tower's documentation (http://docs.ansible.com/ansible-tower/2.4.0/html/quickinstall/prepare.html#primary-requirements).