I didn't find anything about the TMnDx Workstation or the required procedure to update the software for ICD10. If you still have the software installed, go to the installation directory and look for user guides or manuals. Additionally, go to Help > Contents to learn more about it.
After additional search, the software appeared on a website owned by Medusind Solutions.
You can read the full statement here: http://tmjtherapycentre.com/professional/tmndx-software