Have just now managed to download Sync3 v3.0 from the Ford AU Owners website. The file name for me is "JR3T-14G381-AL-PKS.zip" and is around 2.2MB in size.
I suggest clearing your browser's cache and history and trying again. Last week when it wasn't working for me I think I noticed part of the URL for the button "Update New Version" on my profile page read "/en-in/" whereas tonight it was "/en-au/" ...
https://www.ford.com.au/owners/owner...your-sync.html
I could be wrong, but if my aging memory is correct in that recollection, then maybe there was a coding error that Ford have now fixed.