It looks like you've disabled all the download settings for your products, so even though you have files uploaded your items have their download links disabled and thus they are not appearing as an option for updates. It also looks like you did that intentionally as a reaction to the changes to EU VAT, which has been a big strain on everyone. :(
If you edit the product in question and check the Single File Download setting again it should start appearing in your Updates menu. You may also want to make sure the proper file is uploaded, and you can test that in advance using Seller Admin > Send Free Download Link.
Afterward you can turn the Single File Download setting off so that you can continue delivering by other means if that is your preference.