Getting OrCAD/Allegro 17.4 officially requires an active Cadence license or a trial account. Version 17.4 is the previous stable release, now largely succeeded by
Base Release: Extract the downloaded ZIP archive and run setup.exe. orcad allegro 17.4 download
Introduction: The Gold Standard in PCB Design Getting OrCAD/Allegro 17
You're looking for a download link and review of OrCAD Allegro 17.4! orcad allegro 17.4 download