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Still the game wasn't meant to be downloaded in parts, all 3 were meant to be installed. If zombies was meant to be installed on it's own, they would have made a standalone version. SP, MP and Zombies all share files, if you come across something that is missing that the game needs, you will get an error. That means you'll need to install either SP or MP, probably both as you wont know what file is needed or from where.
Missing files coud cause crashes and other problems.