My problem was that the download took a horrible amount of time before beginning, and then, started to download at a slow speed, and finally stopped and telling me the source couldn't be read.
I'm trying to download it again right now, and it seems to be fine for now, even if the speed is still slow, no problem occured.
It seems it was a personnal problem, or something with the server, but it's fine for now. Thanks for the fast reply.