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There is no "free full version" available for download. The only legal ways to obtain 17.4 are:

There are three primary ways to access the software depending on your user status: Cadence SPB / OrCAD 17.4 System Requirements cadence orcad and allegro 17.4 download

Run the license server configuration utility provided during installation to activate the software using your license file or server. Key Components Included in 17.4 There is no "free full version" available for download

Cadence OrCAD and Allegro 17.4 Download: Complete Setup Guide cadence orcad and allegro 17.4 download

Seamlessly view your PCB in 3D while routing in 2D.