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Hi,
1. What version of the program are you using?
2. Try his tip - "How to Activate Mathcad Prime 7.0.0.0 Using Product Code?": https://community.ptc.com/t5/Mathcad-Installation/How-to-Activate-Mathcad-Prime-7-0-0-0-Or-8-0-0-0-Using-product/m-p/721634#M414
1. Read the following announcement - "Official PTC Mathcad 15 and Prime 1–6 End-of-Sale Announcement": https://community.ptc.com/t5/Mathcad-Tips/Official-PTC-Mathcad-15-and-Prime-1-6-End-of-Sale-Announce...
2. "Mathcad Contacts":