App doesn't start

Try the following:

On your root drive (where your program files are installed), usually drive C:

go to directory

   C:\ProgramData\PTC\Mathcad Prime

(Note that the ProgramData directory is normally hidden, ) You will find a file named

   MathcadPrime.exe.V7.Config

and/or

   MathcadPrime.exe.Config

that may be corrupt.

Delete the file. No worries, Prime will recreate it if it is missing.

(If you are unsure, rename it to      MathcadPrime.exe.V7.Config.old      or so).

After that start up Prime.

Success!
Luc