MathCad mcd conversion

Hi, 

I have downloaded MathCad Chemistry Selection tool from 

www.ti.com/.../sluc138

and 

MathCad Express from www.ptc.com/.../free-downloads

When following the instructions on MathCad Chemistry Selection Tool - 

I am instructed to use the chemselect_cont.mcd

However MathCad only uses .mcdx.

Upon renaming the file  to mcdx - > the file cannot be opened and I am prompted with an error message .

Math Cad also installs with a MCD converter 

following error occurs on execution:

MATHCAD15 M010 or later is needed ....