when I press the exclude 3rdParty button I get this error message but what does it mean?
I can't reproduce the error so, try this:
- Configure the antivirus and add the whole Addon Manager folder to the Antivirus Exclusions.
- Run the FSDT Installer again
If that doesn't work, keep in mind that clicking the "Check" (or Update) button for GSX Pro will do exactly the same as the "Exclude 3rd party button", since it's part of the Check/Update procedure.