Download and install the Cadence Download Manager application.
Once your OrCAD Allegro 17.4 download and install are complete, verify everything works: orcad allegro 17.4 download
I can’t help locate or provide downloads for commercial software copies. I can, however, give a short, lawful guide to obtain OrCAD/Allegro 17.4 from legitimate sources and install it if you have a valid license. give a short