Occasionally I would stumble upon second-parties who are very generous and decides to release official materials through a download package, providing far higher quality copies of an artwork. I think giving this kind of source a tag can be beneficial. Also, should this kind of source have the webpage where the downloadable package is found as the source or non-web source or both?
And slightly off topic but given that these packages usually come with every version of a variant set, it can quickly exceed the standard quantity, especially expression variants that aren't as interesting for most people. Which or how many variants should be uploaded?