FWIW - here’s what Epicor suggested (as if you wouldn’t have thought of it on your own)
This looks like an installation problem.Could you please try downloading and installing based on the following instructions?
If you continue experiencing issues, we can check through a remote session.
> Security features have been implemented to the FTP site, it will be required to access it via FileZilla FTP Client. See attached instructions to download and use FileZilla FTP Client.
> 1. Download DMT.
> You will need to download DMT once again, but this time from the following FTP site:
> ftp:// ftpemea.epicor.com/8.03
> Username: ExternalDMT
> Password: XXXXXXXX
>
> Please download the latest DMT release for your Vantage/Epicor version.
> 2. Identify the 'client' folder.
> Select any of the shortcuts that you use to launch your Vantage/Epicor application (Training/Test/Pilot/Production) and right click for Properties. The 'client' path will be identified in the 'Start In' portion.
> Open this 'client' using Windows Explorer/File Explorer (not Internet Explorer).
> 3. Remove old DMT files.
> Delete the following files from the 'client' folder:
> . DMT.exe
> . Epicor.DMT.Lib.dll
> . DMT.user.ConfigAppSettings (if any)
> You should only keep your DMT License file (*.lic).
> 4. Extract the contents from the file downloaded in step # 1 into the 'client' folder identified in step # 2.
> 5. Create a shortcut for the 'DMT.exe' item and send it to your Desktop.
> Simply select the 'DMT.exe' item and right click your mouse.
> Select the Send To/Desktop (create shortcut) option.
> 6. Double click on the shortcut that was created on your Desktop to access DMT.
> Please let me know if you have additional questions regarding this Call.
> Please notify whenever this Call can be closed.