I was connected, but I've found out what was happening. I had to:
1) Change the language of my profile to English (was in French)
2) Try to download.
3) It says "Sorry, no download avalaible (like before). To have access to them, you have to subscribe to ... (line which was not present before in the French interface)".
4) Subscribe to the free version of the stuff.
5) Download.
=> The problem was the french version of the interface which was missing half of the infos.
(Fun fact: the procedure to change the langage of the interface is not obvious too)