I believe both copies that were available online are not legal. I was quite excited about it so I hunted around to check on the legality, but apparently translations are copyrighted separately.
This would mean that the Pevear and Volokhonsky translation was published in 1997. The version translated by Hugh Aplin was published in 2008.
I'm not an expert in these things so I could be misunderstanding, but that is what I've found.
EDIT: Ooops - someone beat me to it.