Hello Dil,
You may want to install the client from the package, and not by copying. Please, try that. Once you run the package, the installation goes easily, there is everything there to guide you.
The next step is running the client and connecting to server. If your server is in the same local network, and is not encrypted, you should see it in the list of available servers. Otherwise you need to enter IP and port.
If the error still occurs on the client, please check the client log - it's called "hansa.log" (or might be just "hansa" on Windows) and is placed in the main application folder on client.
HansaWorld Support Team