We never had any specific official support for Sharp TVs. I can only guess that brand used what was the app available on the Smart TV Alliance. I’m guessing it was running the old version of the app 3.1.x that stopped development long ago.
We recently disabled some old security protocols on how the app loads that likely is the cause of it’s no longer working on older models that don’t support TLS 1.2. Plex support is ending 2020-09-30 on older smart TV devices
