As explained earlier in this topic, if they released the changes as a patch they would have to do so for all the different localizations, which would then have to be tested against all previous versions. As I understand it, there was pretty much one guy working on the download version, and Larian doesn't have the time or resources to release that many patches (which was why the download version is English only). It was intended primarily for people new to D2:ED who missed DD, and might be inclined to get it if it was available.
Besides, there is nothing wrong with the disk version. If you don't want widescreen support, or don't think it is worth $5-6, then don't get the download version.