In a case of error MiaRec writes detailed information to Windows Event Log.
Open Control Panel -> Administrative Tools -> Event Viewer and select Windows Logs -> Application.
When MiaRec service is started, it writes information about own version and number of licenses, which are installed on the server. See below screenshot for details:

Also MiaRec writes information about any errors. Examples of such errors:
Windows Event Log contains also messages from PostgreSQL database. This is a database, which is used by MiaRec for storing call information.