vSphere Client for ESXi 6.7

Hi:

I'm a newbie to 6.7.  I have a host server running ESXi 6.7.0 build-16075168.  I tried to connect to host using vSphere Client (I guess C#) vers. 6.0.0 Build 51112508.  It won't connect.  Is there a newer version of vSphere Client?  Or, is the only GUI way to connect via browser to IP address?  I guess this by default would use the HTML5 vSphere Client vs. "vShpere Web Client?"

Thank you!

Bob H.