Your keyword includes “upd,” which likely means “update.” That’s the correct path: SolidWorks 2016 service packs (SP1 through SP5) are official updates, not activators. SP5 is the final update (released late 2016). Searching for “solidworks 2016 upd windows 11 compatibility” would lead you to legitimate SOLIDWORKS knowledge base articles (e.g., KB article S-67522 from 2023 confirming that no further updates for 2016 will support Windows 11).