Step 1) Download The Map Pack from here or click on the Download Button ps3,xbox or pc.
Step 2) Plug in a USB drive to your laptop-desktop and transfer the Map Pack on to it.
Step 3) Plug the USB drive with the Map Pack into your XBOX.
Step 4) Now run Black Ops and map will show up.

Download here: http://blackops2codutty.blogspot.ro/