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Make sure that you read the Install Instructions in the mod when you extract it. As long as you copy/paste the folders into the correct locations, you'll have two new folders in your App Data/Strive with nude/preg. Just make sure that the names of the pictures in it are exactly the same name as the portrait and default body (which would be the clothed body in this case). Then just pick the picture ingame, have assigned to both checked, and it'll automatically switch pictures for you.