You can edit an approved or incomplete product and/or provide a new version of your template whenever you want. You can do it directly from the Edit Products section of your dashboard or by clicking here.
You can edit each of the product fields (description, documentation, images…) and/or provide a new version for the template by submitting a new zip file that will replace the old one.
After each update, the product must pass a new review process, usually shorter than the original one. During the review process, your product is downloadable for any buyer of the previous version.