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.
I don't think any Roku TV is considered old enough to be unsupported, but it might be size dependent as well. Larger screen TVs generally have more powerful hardware. But if HBO decided to pull it, there's nothing that can be done short of convincing HBO to support it again.
Dan Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.