Hello everyone,
Regarding to download issue with error 403, there are already clear warning about avoiding using third party downloader, avoid using vpn because there are CID(Country ID) mechanism to prefent specific country box use in another country without permissions, and always use latest version of UFI software because older version will be close for accessing support server.
Please check at Server Load Status in the bottom of Support Download Tab everytime you want to Download.
Make sure the server load number is below 100 so you have optimal connection to download the file.