Both the updated Special Edition AND Anniversary Editions are now on GOG.com
That's right, DRM Free!
That is all.
To paraphrase Voltaire: all you need to enjoy Skyrim is one of its editions and ten thousand mods. >:D
(I beat the original game on PS3, and loved it. I also appreciate the amazing mod community, though I've never once gotten into trying to mod it up for PC -- thought about it seriously long ago, but...)