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The error reads as follows in the attached snapshot.
Read this: https://community.ptc.com/t5/Mathcad-Tips/Official-PTC-Mathcad-15-and-Prime-1-6-End-of-Sale-Announcement/ta-p/818870
and you'll understand why.
If you want to try Mathcad, the only option you have is to try Prime, current version is 11: https://www.mathcad.com/en/try-and-buy/mathcad-express-free-download
Success!Luc
