Most people searching for a "free product key" don't actually need the full desktop version. They just need to edit a resume or a school project. The free web apps do that perfectly.
Install the free mobile apps on your phone for offline editing of small documents. Most people searching for a "free product key"
Sign up for a free Microsoft account (Outlook.com). a family member’s) for another trial.
When the trial expires, revert to web apps. Wait 6 months, then use a different Microsoft account (e.g., a family member’s) for another trial. Most people searching for a "free product key"