Windows 10; 1 gigahertz (GHz) or faster x86-bit or x64-bit processor; 600 MB hard disk space available; Minimum 2 GB of available RAM; Word processor software. Formatting flash drive on mac. Microsoft Word CWYW for Windows: 2010, 2013, 2016, 2019, Office 365 (locally installed desktop version only) Apache OpenOffice CWYW for Windows: 3.x, 4.x. (TL:DR - Office 2019 won't run on Windows 7) It would seem that if you're running Windows 7 and you have an O365 subscription you won't be able to run Office 2019, and because O365 doesn't include downgrade rights, you also won't be able to run the prior version which does support Windows 7.

As reported yesterday, Microsoft changed the way how they license Windows 10 to their OEM partners. But buckle in folks, the changes just keep on coming. In what looks like an effort to push Windows 7 and Windows 8.1 owners to upgrade, Microsoft has officially announced that Office 2019 will only work on machines with Windows 10 and the next LTSC release of Windows Server. That's only the tip of the iceberg though. Unlike previous version of Office that came with 10 years of support, Office 2019's support lifecycle is shortened to five years of mainstream support and two years of extended support. Additionally, the client applications are only available with a Click-to-Run installer. However, Microsoft will continue to provide a MSI installer for the server applications.

(Office 2019 is not compatible with systems sold with a Windows 10 downgrade to Windows 7.). Office 2019 supports both Windows and macOS. Office 2019 is compatible with Windows 10 and the three most recent versions of macOS. It can't be installed in Windows 7 and Windows 8/8.1. You must be using Windows 10 operating system to install Office 2019.

Source: Microsoft

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85 Commentson Microsoft Office 2019 Will Run on Windows 10, and Only Windows 10

Office 2019 Compatibilita Windows 7 Service Pack

Microsoft Office 2019 Windows 7

I don't see how this pushes anyone to upgrade. There really isn't any need to 'buckle in'. Users are always free to keep using Windows XP (wat), Windows 7, Windows whatever and any version of office released while in mainstream support. Office 2010, 2013, and Office 2016 work great. Windows 7 works fine. Windows 8 works fine. Windows 10 works fine. Each OS version, just like the competition, have flaws or annoyances. Always have, always will. No need to sit around and whine - if you don't like the OS you use feel free to write your own and see how it goes.
Microsoft is designing Office 2019 to work with Windows 10 instead a gimped version that is unstable or missing features in older outdated OS releases. It is really simple.