Image of Windows with installed native Nix is at
magnet:?xt=urn:btih:8124507E71C42E5496F922589B3FB79D7C9A90F0&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80 (login Administrator, password Abc123)
Note that it is in early alpha and many things do not work as well as on Linux (for example, Nix Store is not protected from writing)