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Since PTC can no longer sell MathCAD or MathCAD Prine prior to release 7, your chance of getting PTC to fix it or between slim and none.
PTC will issue a new license file for the older versions.
MathCAD 7 and MathCAD Prime 7 are two different animals!
PTC cannot sell any version of MathCAD or MathCAD Prime prior to MathCAD Prime 7 anymore.
You should know this: https://community.ptc.com/t5/Mathcad-Tips/Official-PTC-Mathcad-15-and-Prime-1-6-End-of-Sale-Announcement/ta-p/818870
In short, you'll need help from PTC to get your Mathcad 14 licensed. => Contact PTC support.
Success!
Luc