The VMRC is a separate, free download. You can get it from the same ESXi welcome page ("Download VMware Remote Console"). It provides a better virtual machine console experience than the browser-based one.
This means there is for the vSphere Client 7.0 software itself. Instead, you download the server software, and the client is automatically available through your web browser once installed. How to Access the "Free" vSphere 7.0 Client vsphere client 7.0 download free