Depending on your requirements you can download different flavours. There are images with basic packages included for offline installation. A minimal image for online installation (downloads required packages while installing).
For automatic deployment there are Netboot versions which can be run from any pxe compatible system. Please check the wiki for this setup.
- orbit-os.offline.iso (~2GB)
- orbit-os.online.iso (~400MB)
- orbit-os.netboot.img (~60MB)