Alf's FAQ has links for Nook Study for Mac and Windows:
Mac:
https://customer-care.s3.amazonaws.c...OK%20Study.dmg
Windows:
https://customer-care.s3.amazonaws.c...tudy_Setup.exe
Alf's FAQ:
https://apprenticealf.wordpress.com/...removal-tools/
(Is it okay to post a link to Alf? I think so, but not 100% sure. If not, my apologies, please delete.)
IIRC, someone figured out these are the direct download links from BN's web site before BN removed them. But the links themselves still work. Ironic that BN uses Amazon's servers to host their stuff