If you DO NOT have a SISSA email but you are a visitor in SISSA you can install matlab on your laptop and use it staying connected to the SISSA network.
If you are at home, use the VPN
You can download Matlab here, and use this license file
Decide which version to install and ask to helpdesk@sissa.it the File Installation Key for that Matlab version
Unpack the Matlab zip installation files (or mount the iso image) and run the installer
Click on “Have an Installation Key” checkbox
When the Installer present you a long list of Matlab toolboxes to install, DO NOT CHECK the License Manager package because this is only for the Matlab License Server.