The site says downloads are available for OS X as well as Windows, but when you get to the download page (http://forumnet.ircam.fr/shop/en/forumnet/59-mu.html) there’s only OS X. What’s up?
look in the Archives(follow the link at the left of the download page). The last release is for the moment just for osx, but the previous one is avalaible for windows.