Installation is working now.
After installing the license on the IBM i you should go direct to
http://<your_server_ip>:10081
You will then be presented the wizard to setup the zend server and entering the passwords for admin & &developer.
It seems that if you go to the 5250 menu and try to set already the password, the internal db (sqlite) is not updated.
So my solution, remove the license from the system re-install and go direct to the http site without passing the green screen menu.
Hope this can help.
This is based on the advise from the support team, with many thanks.