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1. What version of the program are you trying to install?
2. What error message did you see on your screen?
See solutions from this article - "Mathcad Prime installer fails with status "Unsuccessful"": https://www.ptc.com/en/support/article/cs200121
I'm afraid you're at the mercy of PTC support (which this forum is NOT) to help you out.
You may want to open a support Case here - "Open a Support Case": https://support.ptc.com/apps/cs_loggers/case_logger/auth/ssl/log
Success!
Luc
Try also to use this link: https://alfasoft.com/product/mathcad-prime-10-trial/