Instructions on using COD Black Ops 2 saves:
1. Download desired Call Of Duty BO 2
save file to your desktop and extract it.
2. Select save files, right click on them and choose Copy
3. Navigate to game installation folder and paste copied files to "players" directory.
4. Start your copy of Call Of Duty Black Ops II
and resume game.
Game installation location:
C:\Program Files (x86)\Activision\Call of Duty Black Ops II
For brand new game installation:
If you have a brand new game installation
(which means you didn't play game before using downloaded savegame), it is recommended to start the game, and exit right after the first mission starts.
Do it before following the instructions above. This method will create necessary files within the game save directory.