Solved
License Service Appears to Be Busy
I've started the process of trying to install MathCAD directly from your website. I tried yesterday and today. I got a message saying the "license service appears to be busy. Please try again."
Similar issue - "Issues with Trial License": https://community.ptc.com/t5/Mathcad-Installation/Issues-with-Trial-License/td-p/848314
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