This is possible only if you have a SISSA account.
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click on “Accedi”
insert your sissa email as login, e.g. <username>@sissa.it
click “avanti”
you will see an image of SISSA and can now insert your SISSA password
if you connect from a Windows or Mac computer you will see in the upper right corner an Icon “Installa Office”
Select “App di Office 365” and then Office will be installed on your computer.