Office 2016, 2019, 2021, and Microsoft 365 (formerly Office 365) do not support OS X Lion 10.7.5. Microsoft dropped Lion support with Office 2016 version 15.25.0 (released in 2016). If you try to install a modern Office installer, you will receive an error: "This version of Office requires OS X 10.10 or later."
You need the original ISO or DMG. This is a 1.2GB file. (Verify the SHA-1 checksum if possible to avoid malware). microsoft office for mac os x lion 1075 updated
If you cannot find a copy of Office 2011, consider using LibreOffice or Apple's native apps (Pages, Numbers, Keynote), which often maintain better compatibility with older hardware. Office 2016, 2019, 2021, and Microsoft 365 (formerly