The program Mathcad was originally developed by a company named Mathsoft. It started as a program running on MsDOS, (versions 1 and 2) then moved to Windows (versions 3 to 15). By the time Mathcad 14 was being developed, PTC acquired the company. They then started to create a new program, Mathcad Prime, which is generally also referred to as Prime, and it is what you are using.
'real' Mathcad 11 is the successor of Mathcad 2001i (version 10.5), and the predecessor of Mathcad 12. It was released around 2003 and, as far as I am concerned, the best Mathcad ever. It is by now out of support (as are all Mathcad versions, and the Prime versions 1 through 6), but as long as it runs, it runs.
PTC has a (what I'd call: lazy) kind of support. If you're not careful, support questions end up on this forum (for installation and licensing problems), or the other forum (for more functional problems). In your case you should create a support ticket. Try PTC support.
Success!
Luc
