.acsm files do not open in Adobe Digital Editions 4.5

[maryf20101078]

My ebooks download with extension .acsm.  I connect my Kobo eReader.  I open the .acsm file with Adobe Digital Editions.  I get "Error: Check Activation".  Adobe Technical support cannot help and refer me to this forum.

[Nanaky · Accepted solution]

Windows:

    Close all applications.

    Press WINDOWS + R.

    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

    Remove the Adept Folder.

    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.

[twilaB838]

I have th e same problem and have done everything you stated to no avail so now what?

[default1o65ou22hn3z]

Me too.  The Adobe tech support just said that the software was no longer supported and pointed me here.

[erinj2824952]

I was getting this same message.  I erased the authorization for my computer on digital editions and then reauthorized, seem to fix the problem.

[Gracie J.]

Both ADE phone app and Windows software is showing the same error. No internet connection even though I am connected to the internet. And when I try to open my CSM file, it shows gibberish texts.

[michela5E30]

ma sei poi riuscito a risolvere??? NON RIESCO A LEGGERE I LIBRI DELLA BIBLIOTECA...le ho provate tutte

[ugo.pellegri@alice.it]

Ho provato più volte, probabilmente anche a causa della mia limitata competenza, senza successo.

Inviato da iPad

[Tony2708566628ow]

I am trying to open a recently downloaded e-book *.acsm file with Adobe Digital Editions but i keep getting the following error message;

I have tried unauthorizing and re-authorizing my computer but continue to still get the same error message.

[lynnb19020793]

I am getting the box with the same problem running Windows 11