Unzip the archive previously downloaded to install Talend Open Studio for ESB.
You can do it either by using:
7Zip (Windows recommended): Extracting via 7-Zip (Windows recommended).
Windows default unzipper: Extracting via Windows default unzipping tool.
Linux default unzipper (for a Linux based Operating System): Extracting via Windows default unzipping tool.
Once extracted, you get ready to use Talend Studio and Talend Runtime.