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That's not PTC's usual policy. (They want to make thing complicated, is my suspicion.)
Try the last link provided by VladimirN from here:
https://community.ptc.com/t5/Mathcad-Installation/I-get-no-email-with-installation-file/m-p/1042785#M5042
Success!
Luc
So what does the error information say (click on the indicated position):
Success!
Luc
There was a similar issue before - "Error during Installation - Error at 1%": https://community.ptc.com/t5/Mathcad-Installation/Error-during-Installation-Error-at-1/m-p/725131
P.S. And article - "Error "Some applications failed or cancelled Click information icon of failed applications for details"": https://www.ptc.com/en/support/article/CS290899
