Walking Dead PC Unable to download episode 4 or 5

I preordered the season pass before the game even came out. I could play episodes 1-3 with no problem. Once episode 4 came out I first received error messages saying I had to purchase the episode (even though I already have a season pass) it now shows that I purchased episode 4 and 5 but am unable to download these episodes so I cant even continue my story.
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