For products using plug&paid hosted storage or your Amazon S3 account, you can generate new download links for your customers at any point after a purchase.
1. Download links are per sale, so visit your "Sales" page and click the menu for the right to find the download link option.
2. You can generate a download link while viewing the infopage for a specific sale. Click on the top right 3 dots menu and find the "Download Link" option.