If you are looking for a small-footprint or free version of Office, consider these official alternatives: Should You Download Windows ISO From Third Party Sites
Even after stripping all non-essential files (templates, proofing tools, help docs, multiple languages), you’d still need at least for a barely working suite. 100MB is physically impossible for a functional, complete Office 2016.
, using even a genuine version—let alone a pirated one—exposes you to security vulnerabilities that Microsoft no longer patches. Corrupted Files