make sure there are no GSX files in your community folder.
Yes, this happens if you manually copied the GSX packages to the Community folder, perhaps trying to "fix" something. The real location of the files MUST the in the Addon Manager folder, the Community folder should ONLY contain Symbolic links to the two GSX packages. This is what the FSDT Installer installs them automatically.
You can verify if the are Symbolic links if they have a very small arrow icon on their folder icon in Explorer. If they are missing the icon, it means they are real folders, which is a mistake so, the solution in that case is:
- Remove the real folders in the Community folder that shouldn't have been copied there.
- Open the FSDT Installer and click RELINK, this will recreate the links as we normally install them.
Note that, you might not have *personally* copied the folders yourself but, it might be a result of using backup software not properly configured to deal with Symbolic links, because many of them will "follow links" on Restore, meaning they will transform a Symbolic link into a real folder on Restore, so it can happen accidentally, if you use a backup software that either is not capable to be configured to handle links, or you simply didn't pay attention to the issue.