It is possible that the download link provided above does not refer to the intended version.
If you are looking for Mathsoft Mathcad, you may try searching for a download link using
Google.
Review
Mathsoft Mathcad is developed by PTC and is used by 155 users of Software Informer. The most popular versions of this product among our users are: 14.0 and 14.1. The names of program executable files are mathcad 14.exe, mathcad (2).exe and mathcad.exe. The product will soon be reviewed by our informers.