Juat copy it, and its language mui - if necessary - from another Windows 7 PC or from the copy in the winsxs-folder, if there is one. It could even be that running sfc /scannow from the command prompt (might need to be run in administrator mode) gets it for you.

If you can't download it, that's either an issue with the (unknown to us) download site or a more general issue with your PC. Then download on another PC to a USB-stick first.

Kees