Where can I download Muse IO? MuseIO, MuseLab and MusePlayer are the same


I bought the Muse several days ago.

And I want to take a look at my EEG, I try to down the Muse research-tools at http://dev.choosemuse.com/research-tools, but I found that I can not find the differences between the software of MuseIO, MuseLab and MusePlayer.
When I click the buttoms of"download" of each software, I can only see the same file of “musesdk-3.4.1-windows-installer.exe” and with the same size. Why?