Since ZK Studio is an Eclipse plugin, we recommend to install ZK Studio via Eclipse Update Manager. It provides a better installation experience and online update mechanism for maintain our release.
We have a detailed step-by-step install procedures in ZK Studio Installation Guide:
http://www.potix.com/smalltalks/zkstudioins/
Please follow the link according to the Eclipse version number (v3.3 or v3.4) of your Eclipse Installation to complete the installation.