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I don't find any download link on that first page anymore, and the second one has Nook for Windows 8 but not earlier versions.
I found a cached version of NookStudy (basically the same program) on a third-party site and verified that it's the same program I downloaded from B&N a few months back:
One warning: it's one of those pages that has so many ads and "Download" links that it's very hard to find the right one. You want the green button about halfway down on the left, labeled "trusted DOWNLOAD 48.4 MB."
Nook for PC on Windows 7 no longer appears to do anything useful.