Try searching TPB or google.. the skidrow version works for sp but i would buy it (BTW you need a really good PC) my computer can play cod4/mw2 maxed out settings but black ops lowest settings possible lags an ass. ):
Use google, or any torrent search engine to find the skidrow rip of the game. But nobody can give them to you here because outside links are not allowed. You can do it through PM, but it would be best not to trust every little thing you download.