A number of the links on the download page do not work. http://www.mattermost.org/download/
Thanks for letting us know! We moved some or our documentation files around and it broke the links, everything should be fixed now.
The links to the install guides are broken, too. http://www.mattermost.org/installation/
Thanks @phu, fixed as well, we found the root cause. Highly appreciated! If you see anything else, please let us know.