explains the technical steps to properly uninstall and deactivate product keys. For a free, lightweight alternative, Microsoft Q&A
When installing Office 2016, choose > Install Options . You can set applications you don't use (e.g., OneNote, Outlook, Publisher) to "Not Available." A skeleton installation of only Word and Excel is roughly 800 MB —still not 10MB, but significantly smaller than 3GB.
Have you encountered a "highly compressed" scam? Run a full antivirus scan immediately. For legitimate, lightweight alternatives, stick to Microsoft’s official web apps or open-source solutions.
Compressed versions are static. You won't receive critical security patches from Microsoft , leaving your data exposed.