It’s possible to install 21 on several major platforms:
- Ubuntu 14.04+
- Debian 8
- CentOS 7
- Fedora 24
- Mac OS X 10.11
- Windows 10
There are a lot of wrinkles, but the team on the 21.co slack channel will help you work through them–without question.
A super easy get-started for techies may be found here.