Restoring purchases on Walking dead season 2

Hi telltale games. I downloaded The Walking Dead Season 2 on my iPad mini iOS 9.3.5. I purchased episodes 2-4 so far. I did not buy episode 5 yet because I noticed on Season 1 of the walking dead, the restore purchases button disappears after buying all episodes.
However, with this season 2 ive tried to restore my purchases for episodes 2-4 by clicking the restore purchase button and it did absolutely nothing. It didn't go to another screen or anything. What do I do, and how do I restore my purchases?
Someone please help

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