Plex was working great with the Roku app, but now Roku says it can no longer find my computer. Is there a way to run the setup app again? I tried uninstalling and reinstalling, but the Setup Wizard does not launch. How can I get Roku to see my computer again?
I don’t have a Roku but my first thought would be to go into your Plex settings, say from a laptop, and look at authorized devices. Un-authorize your Roku device. Perhaps that will force the app to go through the setup again
My next thought would be to go into app settings on your Roku device and clear data & cache for the Plex app. I know you’ve uninstalled & reinstalled but perhaps some data remnants were left on the device.