How can I add Italian language to Word 2010?

[VioletBear]

Hello to everyone.
I'm here for the first time and I need help.
I have just installed Word 2010 on a computer with Windows 10, it's not the computer I'm using now.
I'd need to add the automatic correction in Word also for Italian, at present I have only English and French.
I could not manage to find a solution.
Here on this computer, where I have Windows 7, I have Word installed and I have also the Italian language. I remember I downloaded the language pack for Italian some years ago, but now I cannot remember how I did and I cannot fine the way to do it again for my new computer.
I really need you help.
Thank you in advance