Instead of the traditional "Zombies" mode found in Black Ops, Ghosts featured an alien-defense mode called Extinction.

Note that this game was famous at launch for requiring a 64-bit OS and at least 6GB of RAM (though patches later lowered this). Are you having trouble extracting this specific part, or

If you get an error saying "Checksum error" or "Unexpected end of archive" specifically for Part 2, it means your download of that specific file was corrupted and needs to be re-downloaded. About Call of Duty: Ghosts

You only need to right-click Part 1 and select "Extract Here" (using software like WinRAR or 7-Zip). The software will automatically pull data from Part 2, Part 3, and so on to reconstruct the full game installer or ISO file.