To add a little more context: The Marketplace downloads have been a big mess in the past. Behind the download button, there could be anything and any number of files. TAR, XML, PDFs, ZIPs (which could again include anything) of one resource version or even multiple resource versions. That was rather confusing for the users, since they had to figure out on a case-by-case basis what to do with the downloaded files and often it would lead to problems like trying to install a template as plugin, plugin as app and so on. The new system forces any resource to be a single file of a specific type. That’s a huge step forward and is the only way to allow the (now possible) one-click installations which benefit a large percentage of the users.
Additional resources now need to be provided in a different way, but it is still possible. Check with the author of the file how to get those if it isn’t mentioned on the product page or the Additional Information tab. There is no need to keep full downloads just for the 1% of resources which had additional files in the package.