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After a bit of Googling around it seems like you can download the digital copy without purchasing a cd key but the link to the installer is not on the official Blizzard site.
However it's been linked to on high quality d3 community sites and even these forums without the linker getting banned but there hasn't been any 100% confirmation that these links are legit.
So, just to be safe is it 100% safe/legit to download this file (note: it's for the north american US client)
The link was pulled from this site:
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