Hello Guillier, and welcome to the community!
Thank you for contacting us about this.
As of now, direct data download via FDSNWS service or other means is unavailable due to server issues that have caused problems for the last month or so.
No other data download alternative solutions are available, but we are working daily to bring back legacy data availability for everyone. You can follow all updates here on our forum, with the latest messages being the most recent: Live Data Issues
We cannot provide an ETA for total service restoration, but more information will be available before/after the coming weekend. No data has been lost.
We apologize for any inconvenience this ongoing issue may have caused/is causing, and thank you for your patience.