We all need it at some point, whether it's Microsoft Office 2007, 2010, 2016, 2019 or even Office O365. The fact is, it is too expensive to some and Microsoft's move to a subscription based model where you pay a yearly fee is not helping. That is why I switched to LibreOffice, permanently. LibreOffice is a free and open-source application available on Windows, Mac & Linux! There is even a portable version that you do not need to install.
You see, the more of us that use LibreOffice, the more standard it becomes and the minor incompatibilities diminish. Even Businesses can use it for free, and I hope more do. You can open and edit Microsoft Office created files (Excel, Word, PowerPoint, etc.) in LibreOffice without issues from my experience and even save in the same format.
So give it a try! Save some money and let's help Microsoft reverse their decision to move to a subscription based model.