Give me Mathcad Express please

Download an evaluation copy of Mathcad Prime.  (Current version is 6.0)  It will function as a full version for 30 days; after that (without a paid license) it becomes Prime Express.  I'm not sure you can download Express by itself.

Which means go (e.g.) here: http://support.ptc.com/support/mathcad_downloads

click on the 'download' for Prime 4.

Fill in the form with your data.

You'll get a download link by e-mail for Prime 6.

Download and install the software. During the installation you can choose between a license for an evaluation period (30 days max) or install as Express immediately.

Success!
Luc

https://www.mathcad.com/en/try-and-buy/mathcad-express-free-download