Software like LibreOffice or Apache OpenOffice provides full-featured office suites that are entirely free and legal.
Instead of risky "cracks," consider these legitimate ways to use Windows and Office: failed Windows Updates
Unauthorized modification of system files can lead to frequent crashes, failed Windows Updates, and long-term performance degradation. failed Windows Updates
Microsoft offers a web-based version of Office (Word, Excel, PowerPoint) for free with a Microsoft account. failed Windows Updates