Installing the certificate of "Groupe PSA" Certification Authority in Internet Explorer

Click on "Downloading certificates"

A new windows appears with certificates list

Choose the desired authority and click on "open"

Click on "Install certificate ".

Keep "Current user".

Leave default options.
Except for "PSA Peugeot Citroen Root" choose "Place all certificates in the following store" and select "Trusted Root Certification Authorities"

Click on the bouton "Finish".
The installation proceeds and must end with this message: