The actual path differs between servers. We have looked into this, and it appears to be a problem in the Windows system code. You can work around this easily by using an HTTP mirror instead of an FTP one. If the md5sum of the .iso file matches, the file is correct. If you get a wrong MD5SUM after the first rsync run, just re-run rsync.
Some more feedback is appreciated.
We could use a few more mirrors worldwide for the .tar.gz and .zip files.