Open the Store app on your Windows 10 PC, search for "Office" or "Microsoft 365," and select Get in store app to install.
A powerful, open-source desktop suite that is frequently updated and completely free. microsoft-word-download-for-windows-10-get-into-pc
Sign in to your account at Microsoft 365 and select Install apps to download the latest version of Word, Excel, and PowerPoint. Open the Store app on your Windows 10
A long-standing free alternative, though it is updated less frequently than LibreOffice. LibreOffice search for "Office" or "Microsoft 365