Please help me

I accidentally deleted The Walking Dead (First episode) but i still have from 2-5. I tried re installing it and it's making me pay 400 microsoft points, even though i bought it before. I tried going into download history to re-download it but it still makes me pay the 400. I was wondering if i bought it would i have to buy the other episodes again or not? Or is there a way for me not to pay the 400 (since i already downloaded it before)

I was just wondering if anyone here could help me with this
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