If you obtained a trial installer, use the trial license key provided by PTC. Note that trials cannot be extended.
Once you've downloaded the installation files, follow these steps to install Mathcad 15: mathcad 15 install download
Certain extension packs and integrations work more seamlessly in the older environment. If you obtained a trial installer, use the
Once you have the installer (usually a file named Mathcad15_M010_Win64.iso ), do not just double-click it. Modern Windows security will block the license manager. If you obtained a trial installer