Solved
What happened to the collection of worksheets library?
There was a useful collection of worksheets available until recently with a wide selection of topics in engineering: Civil, Electrical, thermodynamics, physics and mathematics, but suddenly it is no longer available. Withdrawing a library with the perception of profit making is the short-term narrow mindness of salesman instead of fostering the use of Mathcad for the long term which is what Mathworks has been sucessfully doing with its well established product Matlab.