Thanks for your reply.
There is no another option to have more disk capacity?
It is really hard for me because it would mean going from paying 80 USD to paying 270 USD a year.
More taking in account that my website is not really selling…
1. I unchecked “Grant access to downloadable products after payment” and everything is OK now: The order receipt (first email) does not show a download link and refreshing the Checkout page does not show it neither.
2. Bluehost did not give me a solution regarding the processor (disappointing support). I had to manually activate the processor. After this, the order was completed and the email was sent with a correct download link.
3. The quality of the downloaded image is OK again, even if I don’t know why this was failing.