Licenence

"How to obtain Mathcad Single User and Student Licenses": https://community.ptc.com/t5/Mathcad-Installation/How-to-obtain-Mathcad-Single-User-and-Student-Licenses/m-p/706384#M16 

Choose "Activate purchased license": You will then see a log in screen where you need to log in with a PTC account. The you should see a form where you can enter you product code: You will then automatically get a license file sent to your machine and can start using all features.