how do I re-authorize my laptop so I can download library books to my Kobo?

[can_t_open_books]

I had to purge my computer and re-install everything.  I've downloaded Digital Editions 4.5 but cannot transfer downloaded library books from my laptop to my Kobo e reader.  I think it may be a problem with the authorization.  How do I fix the authorization now?  Can I just uninstall the software and reinstall it to start over again?  I read that another member's similar problem was resolved by going back to version 3.  Should I try that?

[Nanaky]

Windows:

    Close all applications.

    Choose Start > Run.

    In the Open text box, type regedit and then press Enter. The Registry Editor opens.

    In the left pane of the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Adobe\Adept

    Select the Adept key.

    Choose File > Export.

    In the Export Registry File dialog box, select Selected Branch under Export Range. Enter a name and location for the backup registry key, and then click Save.

    Right-click the Adept key and choose Delete.

    In the Confirm Key Delete dialog, click OK.

    Close the Registry Editor.

    Open Adobe Digital Editions and reauthorize.

Macintosh:

    quit Adobe Digital Editions.

    Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.

    If you are using 10.7, see https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html

    Open Adobe Digital Editions and reauthorize.

If  not work say which error message you get when you try to transfer.

[can_t_open_books]

You say"Enter a name and location for the backup registry key". What name

and location should I use?

[Nanaky]

This is you own decision.