As I've said in all previous posts, if you are missing the thumbnails, it's a problem in your local network node OR you antivirus is blocking the latest updater to "update itself" so:
- Configure the antivirus to have the whole FSDT Addon manager folder added to the antivirus EXCLUSIONS
- Run the FSDT Live Update again.
- If that still doesn't work, DOWNLOAD and install the latest OFFLINE installer. It contains all thumbnails, it's just not possible you would see this error by using it.
But it must downloaded and installed again after the date of its latest version, which should be obvious, since it's completely offline, it doesn't have the ability to update itself, so you must redownload it each time there's even the smallest update.