To download data or products, particularly on the IDS theia.cnes.fr, you are required to have a Theia account.
The creation of this account is free and open to all.
Please visit go to the account manager on Internet: https://sso.theia-land.fr/
For DINAMIS users
A Theia account also provides access to the DINAMIS data portal.
Beware! Users of Spot 6-7 images, archived or new, must have a GEOSUD account before they can have a Theia account.
The whole procedure to acquire one is detailed here:
If you are having trouble logging in to your account, you can reactivate it on this page: https://sso.theia-land.fr/theia/profile/recovery.xhtml
If this procedure does not provide enough results, contact THEIA support.