For those who already had the full Allegro 17.4 suite installed but just wanted to open a quick secondary viewing session, Alex pointed out a hidden shortcut: the viewer executable, allegro_free_viewer.exe , is often already tucked away in the C:\Cadence\SPB_17.4\tools\bin directory.

: If you already have a full version of Allegro 17.4 installed, you do not need to download a separate viewer. The executable is located at: C:\Cadence\SPB_17.4\tools\bin\allegro_free_viewer.exe Functionality

Go to: https://www.cadence.com/en_US/home/tools/pcb-design-and-analysis/allegro-free-physical-viewer.html

: You will typically need to provide an email address to receive a direct download link and installation instructions.