Thanks for your reply. If it is defunct Roku should remove the app instead of assuming it's on my end as you stated it isn't. I didn't want to remove the channel just in case it returned, but I think I'm going to soon.
You can always reinstall it later from the Roku Channel Store. If you like the genre, there are a couple other ones if you just search "Retro" from either your device or the online Roku Channel Store.
https://channelstore.roku.com/search/retro
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I am not sure of Roku policy regarding channel removal regarding dead or abandoned channels. I have to assume someone, somewhere, reaches out to the developer eventually.
