i tryed a few time, waited more than 5 minutes, tryed again, cleared my session, tryed again but i've got a connection time out at the "downloading data" step.
i will try again tomorrow...

same problem today.
i solved it by opening a port in my firewall from the server ip.
i don't undestand why since it was working fine before but well, if you're stuck at "downloading data", your firewall can be the issue now.