Change "Seller" / Get Steam key from a Humble Bundle purchase

Hi, I bought Aseprite from Humble Bundle and I would like to know if I could download it from another source like Steam - as an example. This will allow my Aseprite to update by itself. Is that a possibility?

That’s possible, you can redeem your Steam key from your Humble Bundle page, if you lost the link, you can contact us at support@aseprite.org