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Under "All Products", on the side, as a drop-down item.
It's a sore spot on a personal level for me. There are multiple back-stories behind it, but there are reasons (and a few benefits) why Mathcad has its own mathcad.com website.
The Products page has since been revamped so Mathcad is no longer hidden away, among other things.
https://www.ptc.com/en/products