Microsoft has announced that the new version of MS Office. Will only run on Windows 10 (and Windows Server).
So MS Office 2019, due for release in the second half of 2018. So to install, expect to have an up to date version of the Windows 10. Including all the latest patches and updates. These should happen automatically if your Windows 10 PC is connected to the internet.
The traditionalists amongst us can rejoice in the fact that MS Office 2019 will be a purchase. Rather than the MS Office 365, which will still be available. So a fully installed program, rather than cloud based.