Check for the file noah4.lf . If it is missing or you need to re-register, delete it and restart Noah to trigger the registration prompt. :

For hearing care professionals, HIMSA recommends using the official download portal to reinstall the file if it was blocked by antivirus during the initial setup.

Are you currently seeing a like 50138 or 50108 while trying to launch the software? The NOAH_SERVER_ERROR error message - HIMSA

Navigate to C:\Program Files (x86)\Common Files\HIMSA Shared .