- Turn off the firewall
- Configure the antivirus to add the whole Addon Manager folder to the antivirus Exclusions
- Run the FSDT Live update again
- If that doesn't work, download and install the FSDT Universal installer, and use it to UPDATE GSX.
- If that doesn't work, restart Windows and try again an update
- If that doesn't work, be sure your Windows is fully updated, perform all the updates, restart Windows and try again.