Look for a mail titled "Your purchase of 'When The Night Comes'" you can download it from there or go to your purchases page!
Viewing post in WTNC: The ReVamp Available NOW! comments
Hey :) So I'm not sure if you still haven't been able to get the game, but it's just as the person said :)
Whatever email account you use for Itch, will be the email they will have sent the download link to for the game. It helps to find by copying "Your purchase of 'When The Night Comes'" into the search bar to filter the email out, and it'll be there :)