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Your product key is for all the world to see on this site: https://community.ptc.com/t5/Mathcad-Installation/issue-while-installing-Mathcad-prime-student-version/m-p/1052156#M5228 . You may want to edit it out.
Did you follow the steps as outlined here: https://www.ptc.com/en/support/article/CS440903 ?
Take special notice of the fact that you need to start setup.exe as administrator.
Success!
Luc
