Depending on your operating system, the downloaded file XnTcpXXX (where XXX is the release number) will be in .zip or .tar.gz format. By expanding it, you obtain the directory XnTcpXXX, containing:
license.txt
The license of use
XnTcpXXX.hex
The firmware, to be uploaded to the SBC65EC board
XnTcpXXX.img
English Webpages image, to be uploaded to the SBC65EC board