Hi Oufouanas,
It appears to be some issue with your network configuration. Please ensure you are able to browse the web and connect to other websites on your machine. If yes, then try any of the following.
- Please look at your firewall settings and rules, if they are blocking the installer to connect to the MATLAB servers.
- Alternatively, download and then install MATLAB. Follow this link for more instructions: https://www.mathworks.com/help/install/ug/install-using-a-file-installation-key.html
Thanks,
Gyan