That, unfortunately, is the price you pay for buying a ‘smart TV’. It’s been obvious for some time that manufacturers will stop updating the apps they install on the set’s OS, it’s no different to phone manufacturers, who are often making the TV sets as well.
Your option is a box like an AppleTV, Romulo, Firestick, or something like that.
I don’t know what will work best in your circumstances, my telly is 13 years old, and doesn’t have any so-called ‘Smart’ bollocks, I’ve got a Sky box and my Mac Mini hooked up to it, and when it’s finally replaced, it’ll be used as a dumb screen, I don’t want any smart stuff working on it.