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Hi,
If you are looking for the latest version of Mathcad, then here are the links.
Mathcad Prime 7.0:
https://www.mathcad.com/en/try-and-buy/mathcad-express-free-download/install
https://free-dl.ptc.com/install/pim_installmgr_mathcad.exe
"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...
Do you need help for any specific question?
You can refer @VladimirN answer (Mathcad Knowledge Base) in this post https://community.ptc.com/t5/PTC-Mathcad/Mathcad-Prime-knowledge-base-articles/td-p/494955?posno=8&q=Mathcad%20knowledge%20base&source=search and see if it helps.
Or, you can refer Mathcad Prime Help Center here https://support.ptc.com/help/mathcad/r7.0/en/