Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Installed channel and launched fine on Ultra 4660 as well. Website ok too.
I did not see any exclusions for particular Roku devices on their site. As well as @DBDukes suggestion of performing a System Restart, perhaps try a Manual System Update of your Roku device. Settings...System...System Update...Check Now.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insigna RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941