Hi! I was able to download the Viki app about a week after I posted the question. I clicked on one of the shows and gave me the option to download the Viki app. Viki version 2.19.2 is what it is ...
I have just purchased a Chromcast with Google TV. I see Viki shows listed so I clicked on it. However, it says Viki is not compatible with the version of my device.