Could you please provide your detailed issue as it is missing in the thread.
This might be code for Fabricated Quadrilateral Equivalents Found Graphed With Rectangular Edges. Or maybe not. 😎
If you are looking for the latest version of Mathcad, then here are the links.
Mathcad Prime 7.0:
"Step by Step Installation Procedure for Mathcad Prime 7.0 Express Edition": https://community.ptc.com/t5/PTC-Mathcad-Installation/Step-by-Step-Installation-Procedure-for-Mathca...