You say you ran the install script (zc_install/index.php)? Did you delete it afterwards as it isn't there now?

I suggest replacing the zc_install directory and running the install script again paying attention to any warnings about file permissions etc.

When the install script has completed successfully, it'll give you the option to go to the store's home page or admin. If it doesn't give you the option then something has gone wrong with the installation.

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Lawrence