Microsoft provided an update on Office 2019 yesterday, revealing that the applications will run only on Windows 10. In an article supporting the service and support of Windows and Office, Microsoft revealed you will need to upgrade to Windows 10 if you want the latest version of Office without subscribing to the Office 365 service Of the company.
It’s a clearly designed to drive businesses that are not yet on Office 365’s subscriptions since the stand-alone Office software will be supported only on Windows 10 and not Windows 7 or Windows 8.1 OS. This will not affect Office for Mac, a separate product with a different version table. Microsoft is also changing the support lifecycle for Office 2019, so you will receive 5 years of mainstream support and then “nearly 2 years of extended support.”
This is normal for Microsoft first they stop supporting the browser then comes office.