I have Mathcad Prime 2.0 with Product Code numbers; how do I get the License Key?

I have a legal 32 bit CD for Mathcad Prime 2 that I used for many years on my old laptop which had Windows 8 OS. Microsoft does not support Windows 8 anymore. So, I bought a new laptop which has Windows 11 OS, 64-bit machine. I also have legal 64 bit CD with Product Code for the Mathcad Prime 2. I installed it on my new laptop but having hard time getting the License Key. Therefore, I will appreciate if someone from the PTC or the PTC community could help get the License Key!