Considering that there is no Mathcad Prime 8.0 "professional" you must be asking for "real" Mathcad 8.0 Professional, the program that was brought out in/around 1998.
Well, you should read and understand this: https://community.ptc.com/t5/Mathcad-Tips/Official-PTC-Mathcad-15-and-Prime-1-6-End-of-Sale-Announcement/ta-p/818870
I think your best options are, (and I assume you still own the CD with the installation source, and you saved the licensing information):
- Find a friend that owns a PC with CD drive to copy the contents of the CD over to a USB stick.
- Buy a CD/DVD drive with a USB interface to connect to your new PC, so that you can install the program.
Success!
Luc
