I've played through three episodes of the Walking Dead so far, and I have bought all five of them. I downloaded episode 4 today, and when I started up the game to play it, it popped up with a message saying that I had not purchased the game, I don't have the license to play it, and I cannot play it unless I buy it.
...Which I've already done.
I bought it here on Telltale's main website, and my 'games' page says I own it.
What's the problem here?