If you have successfully installed Mathcad 14 on Windows 11 but encounter specific bugs, these registry edits can help:
The most stable method is running Mathcad 14 inside a virtual machine (e.g., VirtualBox, VMware) running Windows XP or Windows 7, effectively isolating the old software from the new OS. Comparison to Modern Alternatives mathcad 14 windows 11
Mathcad 14 on Windows 11: A Complete Compatibility and Installation Guide If you have successfully installed Mathcad 14 on
If native installation fails or licensing/dongle drivers are incompatible, run Mathcad 14 in a virtual machine: mathcad 14 windows 11