PTC will not be able to issue new licenses or provide access to software downloads for end-of-sale versions. PTC Community

: Historically, a 30-day trial of Mathcad 15 was available via a ZIP folder download containing Mathcad15-EN.zip .

For engineers working in legacy industries (oil & gas, defense, heavy machinery), corporate validation processes are written around Mathcad 15 scripts. Changing to Prime would require re-validating thousands of worksheets—a multi-million dollar effort.

The most unique "power feature" of Mathcad 15 is the tool. It allows you to visualize how an engineering mechanism or mathematical system behaves over time without needing dozens of static plots.

: PTC now promotes Mathcad Prime 11 as the current standard. You can download the Mathcad Prime Free Trial , which includes a Worksheet Converter to bring your old .xmcd and .mcd files into the new environment.

While direct official downloads for Mathcad 15 are limited, users can still sometimes find installation files through specific community-shared links or alternative support routes:

However, a word of caution: PTC Mathcad 15 is proprietary, commercial software. There is no "free" hot download unless you are a licensed user. PTC no longer sells new perpetual licenses for version 15, but existing license owners can download installers from the PTC Support Portal.