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You might try to run the MCLicense.exe in the subdirectory MCLicense of you Mathcad installation, and see if you get a prompt for the location of the license file...
Success!
Luc
Thanks Luc. This is MathCad 14.0, it is about 20 years old and on a CD. There is one *.exe file on the CD; for the installation to proceed it needs the "old serial number," so no subdirectories have been established and given the age, no License management system.
Thanks again