Much like any other modern program today, also Mathcad supports the export to PDF format. So using Mathcad seems is the obvious, and most likely also only choice to achieve xmct to pdf conversion as no other program appears to support the XMCT template format that is native to Mathcad.
XMCT format is XML based, which means that you can probably open it using any text editor and print it to PDF there, but that would make document of the source, not of the specially formatted template.