It's a fully-featured, 30-day trial version of the latest Mathcad Prime 2.0.
|Mathcad Prime 2.0 Brochure (PDF)|
If you're not ready to purchase a full licence at the end of your trial, it becomes a reduced feature set, but still highly capable, version of Mathcad for you to use forever, entirely free of charge!
So what are you waiting for?
Download Mathcad Express today 32-bit or 64-bit
Source: Adept Scientific