This sample compiler generates .NET executables (DLLs and EXEs), but it is potentially retargetable, more backends will be provided later.
To run these binaries you will need either M$ .NET framework or Mono (versions from 1.4.x are ok, not sure about older ones). MBase is free and comes currently as a binary only distribution (no compiler is required). It will always be free, core parts may be open sourced (most likely under QPL) when the code cleanup is complete.
Techpreview page contains link to MBase-0.3-generic.zip, I'll try to highlight the link better, thank you for pointing to this issue.
MSI distributions normally comes in a week after the generic zip bundle.