No you have to download them via the client, not as separate downloads. What you can do if you want, is update the client and shove it on a DVD/usb drive, then if you ever have to reinstall your OS or lose a HDD you can install the client, overwrite it with the backed up copy and run the patcher, it'll only patch from the date you'd backed up, instead of since initial release. It'll also have all of your display/UI settings the same.