According to the linked itch.io support article it is linked to your email address and you should be able to recover it at the attached link.
https://itch.io/docs/buying/already-bought
Hope this helps!
According to the linked itch.io support article it is linked to your email address and you should be able to recover it at the attached link.
https://itch.io/docs/buying/already-bought
Hope this helps!