at the launch of zp-core / setup.php, I have an error message "MySQLi reported: No file or folder of this type"
The rest of the installation is good.
An idea to help me out?
My website is at OVH

Did you enter "localhost" as the database server on the database credentials? It may require the actual database server name instead. Please ask your host about that.

Thank you. Actually it was not "localhost" ...
It's ok now for installation
https://www.philippedeletree.fr

Glad you managed it. Now you should also check the SSL certificate on the site as it seems not valid (or does not exist) ;-)

I have just done the necessary. thank you