A quick update to a problem some users have been experiencing problems installing the patch. A new patch has been released and has replaced the existing patch at the same download locations (this may take some time as each mirror must update their download list). In the meantime here is the updated version from the Ubisoft mirror. So if you are having problems installing the patch be sure to pick up this version (this patch replaces the old one and should be downloaded by anyone who hasn't yet updated to the latest version):

Download: Ubisoft Mirror