How to add Zombie Bots on Counter Strike 1.6? Help CS addicts!

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I've been patched the zombie plague in CS 1.6. I just wanna know how I can play alone with zbots. What command should I put in console. By the way, I can't change the CS 1.6 language in English every time I connect to some zombie servers(some of servers) Where can I download the zombie bots(zbots), just the zbots patch?