First, the usual suggestions:
- Be absolutely sure the antivirus is configured to exclude the WHOLE Addon Manager folder.
- Run the FSDT Live Update again.
But, from your report it seems the programs are not really running in Trial, plain and simple.
It only happens when you restart the sim ? That might be caused by not having waited enough time before the next restart, so Couatl .exe didn't had a chance to close itself. In this case, wait a bit more between restarts and, if it doesn't really close, try to close it manually with the Task manager and see if the 2nd restart works.