The instructions below are a more extreme way of removing (possibly corrupt old) authorizations from the Nook.
If you look at the contents of the Nook in a file manager such as Windows Explorer or Mac Finder,
you may find a directory with a name like '.adobe-digital-editions'
It could be a hidden folder, so enable viewing of hidden folders.
- Copy the directory back to your PC for backup in case things go wrong
- Delete the directory
- run ADE and
- try (yet again) to authorize the device.
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I am currently running ADE v1.7.
You might try with 1.7.2, which was the lastest 'old' version,
or even with the latest v2.0 (in my experience things are less likely to work with v2.0 thqn with 1.7.2)
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editio ns.html
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172