I found that the binaries of the OpenSTV program for Windows and Mac are available on the election page. Thanks for allowing us to check the result from the available data. However, on their website, OpenSTV developers sell these files and ask others not to post them online or share them with others. I do not know the license terms of this program, but I doubt that it is ethical to allow others to download these files.
(I do not know whether the files available on the election page are really the binaries of OpenSTV. I have checked only their file names and have not looked at the content.)
Update: I noticed that these files are available only when a user is logged in. I am not sure what this means. As Suresh wrote in his answer, SE may have made some agreement with the developers of OpenSTV, which allows limited distribution to logged-in users.