Download completely t7_full_game.torrent and once it is completely downloaded, we will double click on it

Locate the "Save At" section and click on the blue folder icon, there you need to locate the folder where you have Black Ops 3 installed or for simpler, locate where BlackOps3.exe is.
Example: C:\Games\t7_full_game

Locate the "Content Layout:" section and you will see that on the left side there will be something called "Original" well click on that and put "Do Not Create Subfolder" option and then click on "Ok"

Now in the "Status" section it will show a message saying "Verifying or Checking" this is a sign that the files are being verified and if it finds a corrupt one, it will download it again and replace it with a new one.

That should be all and you should have your cracked Black Ops 3 repaired (Note: this will completely replace the language to English, so keep this in mind if you have another language installed in your game that will be replaced by the English language).