Microsoft ceased distributing trial versions of Office 2010 shortly after the release of Office 2013 and Office 365. Critical Review of Online "Free Keys"
Microsoft offers a one-month free trial for its current subscription service, which includes the latest versions of Word, Excel, and PowerPoint. Office 2010 free trial key
Microsoft stopped providing technical support, bug fixes, and security updates for Office 2010 in October 2020. Microsoft ceased distributing trial versions of Office 2010
“MS no longer supports Office 2010. That means no more updates and no online downloads. They really want to "encourage" people to "upgrade" to 365.” Microsoft Learn · 4 years ago “MS no longer supports Office 2010
A popular, free, open-source alternative that is compatible with Office 2010 file formats (.docx, .xlsx). Perspectives on Office 2010 Today
Keys found on public forums are often volume license keys that have exceeded their activation limits or are illegal, "hacked" copies.