You have tried to download an outdated version of WinBoard.
Please tell the webmaster of the site you came from that he has an outdated link to WinBoard. Ask him to link to the main WinBoard page instead of linking to a specific version of WinBoard.
You can go to the main WinBoard page to find the current version.
(If you really want an old version for some reason, see the archive on the GNU ftp site.)