If you are searching for the you likely need the specific version that supports the .brd file format from the 17.4 release (note: "174" is shorthand for version 17.4).
If the official Cadence portal no longer hosts 17.4, contact their legacy software team via support ticket – they may provide an archive link for long-term customers. cadence allegro free physical viewer 174 download link
Introduction: What is the Allegro Free Physical Viewer? For PCB design engineers, hardware developers, and manufacturing teams, the ability to view and validate complex printed circuit board layouts without a full license suite is critical. Cadence’s Allegro Free Physical Viewer (often abbreviated as FPV) is the industry-standard solution for this. If you are searching for the you likely