The file (WE_20190819_Forum.mcdx) which you have attached is not able to open with the current version of Mathcad Prime 4.0 64-bit which am using in my PC.
I have attached my worksheet in same thread where i asked the previous question.
Thanks & Regards,
You did not state which version of Prime you use and the files I attached were created with the current Prime 5.
Unfortunately Prime is built that silly so that you can't tell with which version a worksheet was created and older versions can't read a sheet created by a newer one. The most bad is that Prime can't save its sheets in older formats, so the only ways to "convert" a sheet from Prime 5 to Prime 4 are to either retype the whole or to have both versions installed, open both and copy every region one by one to the P4 sheet.