Download links stay active for up to 6 weeks after the order has been placed.
Customers will be informed about that time period in the automatic email they receive when the download is available. In this email, they are also asked to reach out to you in case they have not downloaded the images within these 6 weeks.
Once the download link has expired, you'll find the button to renew the link on the order page:
After hitting the button, your customers will be able to download their images.