Hello @lambard_alexandre
Please see this FAQ for how to download individual datasets and dataset collections: Downloading Data
Keep in mind that if you have set up your web browser to block automatic downloads or “cookies”, you may need to adjust or clear that setting. Some web browsers will note that a download was blocked with a warning and allow you to “click” on that warning to permit downloads from specific sites.
If that does not help, please explain the problem with more details. Screenshots can help.
Thanks!