OSPPREARM.exe is a legitimate Microsoft tool used to extend or "rearm" the trial period of Microsoft Office installations. It is typically located in the Office installation folder (e.g., C:\Program Files\Microsoft Office\Office16 ) rather than as a standalone download. Microsoft Learn Key Facts About OSPPREARM.exe

: Only download through Microsoft 365 or official retailers like Best Buy .

C:\Program Files\Microsoft Office\Office16 (or Office15/Office14)