The digital download does support widescreen resolutions (or any resolution supported by your hardware / drivers), and is pretty cheap (IIRC US$5-6 on Impulse/GOG). There are a couple issues with it, though, and a patch should be coming out soon/eventually (some NPCs spin in place, particularly one involved in a cutscene in the church, and a few people have had problems with enemy magic causing crashes or not being able to pick up items or use stairs near one or more locations in the Dark Forest).

There was no patch for the CD/DVD version released due to the amount of extra testing that would have required for all of the different localizations, with each of the previous game versions. The download version was mainly intended for new people playing D2:ED, who might want to check out the first game in the series.