Can I use a Mathcad Prime 4.0 license for Mathcad Prime 3.1?

Hi,

can I use a Mathcad Prime 4.0 license for Mathcad Prime 3.1?

Because if I work with Mathcad Prime 4.0, my projects wouldn´t work with our computer in school.

And if i follow the link, which I got from the school, i only can order a student version for Mathcad 4.0.

Thank you,

Stefan