you cannot download it, as mentioned in the download area: Note: This download does not contain any windows components (i.e. no windows makefiles for the examples and no security component). However, it is fully functional, with the one exception that you can only use local authentication (see chapter “EntireX DCOM Installation and Configuration under UNIX” in the product documentation).
On the Unix side you have to use local authorization.
The Windows components are only included with the full product version.