The entropy (randomness) of Office 2010's compiled binaries is already high. Compression algorithms like ZIP, RAR, 7z can reduce size by at most 30–50% for binary files. Even with repacking, removing help files, languages, and templates, you cannot go below without removing critical functions.
The Myth of the 10MB Microsoft Office 2010: Is It Worth the Risk?
The search for is a ghost hunt. What you will find are malware-laden traps, misleading downloaders, or broken software that fails when you need it most.
Use Google Docs and Sheets for a seamless, web-based experience.