UPDATED: This seems to now be resolved.
Currently, whether intentionally or not Ford have disabled public access to their IVSU’s this means Syn3 Updater and our Manual Methods may not fully work and you may get 409 errors.
Will it come back? no idea but this isn’t the first time this has happened, the last time was presumably from panic security actions relating to the Log4j exploit and reducing public access while the vulneratibility was checked and resolved, this is a guess but the timing lined up well last time.
Just like last time it appears to only be affecting certain files including official download links.
This time it’s unclear what the potential reason might be though.
UPDATE: In the meantime find the files based on the filename elsewhere on the internet and put it in your Syn3 Updater download directory, Syn3 Updater will process it as normal and check the integrity etc.
UPDATE2: Seems even updates from inside the car itself (OTA) are failing, this is probably not intentional.