We get a lot of questions about Office compatibility with Windows 10 like this one: “I had Office 2007 32 bit. Does Win10 free download include Office 10 64 bit or is that a separate purchase?”
Office is not included with Windows 10, just as it was not included with Windows XP, 7, or 8. However, downloading Windows 10 shouldn’t affect your copy office one bit. It should remain unchanged on our current PC and still be good to use. If you want a newer version of Office, you will have to purchase it separately. You could buy Office 2016 or get a subscription to Office 365.