In my case the smart controller came with the Amazon Appstore installed from the factory. I just purchased and installed it from there. When you get done installing it you will need to add Google text to voice app so that the voices sound decent (understandable). Litchi does have this documented on the install instructions for the smart controller/crystal sky page, near the bottom of the page. Litchi does work very well on the smart controller when using the M2Z, don't know about any of the others.