Is to not add this but go get a streaming box like the Amazon Fire or Roku. These at the time cost the same or less than the Samsung and upgraded the TV at the same time.
Samsung's Apps were not that great and you may find them horrible compared to the Roku.
My advice, don't do it. Get the Roku or Amazon Fire.
I have a Samsung tv model #UN46C6500VFXZA purchased in 2010 or 11 The wireless LAN adapter required WIS09ABGN is not readily available. Is there a newer model that might work?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic