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How to Open an Acsm File on PC or Mac

This wikiHow teaches you how to use Adobe Digital Editions to open Adobe Content Server Message (.acsm) ebooks in Windows and macOS. Install Adobe Digital Editions. If you don't already have this free app installed:
Method 1 of 2:

Windows

  1. How to Open an Acsm File on PC or Mac Picture 1How to Open an Acsm File on PC or Mac Picture 1
    Install Adobe Digital Editions. If you don't already have this free app installed:
    1. Go to https://www.adobe.com/solutions/ebook/digital-editions/download.html in a web browser.
    2. Click the Windows download link to download the installer.
    3. When the download is finished, double-click the installer (usually located in the Downloads folder).
    4. Follow the on-screen instructions to install the app.
  2. How to Open an Acsm File on PC or Mac Picture 2How to Open an Acsm File on PC or Mac Picture 2
    Press ⊞ Win+E. This opens the File Explorer.
  3. How to Open an Acsm File on PC or Mac Picture 3How to Open an Acsm File on PC or Mac Picture 3
    Navigate to the folder with the .acsm file.
    1. If you can't find it, type its name (or just type *.acsm) into the search box at the top-right corner of the window, then press ↵ Enter. It should appear in the search results.
  4. How to Open an Acsm File on PC or Mac Picture 4How to Open an Acsm File on PC or Mac Picture 4
    Right-click the .acsm file. A context menu will appear.
  5. How to Open an Acsm File on PC or Mac Picture 5How to Open an Acsm File on PC or Mac Picture 5
    Select Open with…. Another menu will expand.
  6. How to Open an Acsm File on PC or Mac Picture 6How to Open an Acsm File on PC or Mac Picture 6
    Click Adobe Digital Editions. An authorization screen will appear.
  7. How to Open an Acsm File on PC or Mac Picture 7How to Open an Acsm File on PC or Mac Picture 7
    Enter your ebook vendor information (optional). If you don't have this information or don't want to enter it, skip to the next step. Select the vendor of the ebook from the drop-down menu, then enter your login and passcode.
    1. This step is helpful if you want to be able to transfer DRM-protected ebooks between devices (up to 6).
  8. How to Open an Acsm File on PC or Mac Picture 8How to Open an Acsm File on PC or Mac Picture 8
    Check the 'I want to authorize my computer without an ID' box. Only do this if you didn't enter your vendor information in the last step.
    1. If prompted, click Authorize on the pop-up message to confirm this change.
  9. How to Open an Acsm File on PC or Mac Picture 9How to Open an Acsm File on PC or Mac Picture 9
    Click Authorize. It's the button at the bottom-right corner of the window. This authorizes your computer, and a confirmation screen will appear.
  10. How to Open an Acsm File on PC or Mac Picture 10How to Open an Acsm File on PC or Mac Picture 10
    Click OK. You can now read the .acsm file in Adobe Digital Editions.
Method 2 of 2:

macOS

  1. How to Open an Acsm File on PC or Mac Picture 11How to Open an Acsm File on PC or Mac Picture 11
    Go to https://www.adobe.com/solutions/ebook/digital-editions/download.html in a web browser. This is the download site for Adobe Digital Editions, a free application that allows you to read .acsm files on your Mac.
  2. How to Open an Acsm File on PC or Mac Picture 12How to Open an Acsm File on PC or Mac Picture 12
    Click Download Digital Edition Macintosh. This downloads the installer package (.dmg) to your Mac.
  3. How to Open an Acsm File on PC or Mac Picture 13How to Open an Acsm File on PC or Mac Picture 13
    Double-click the installer package. It's the file you just downloaded.
    1. By default, downloads are saved to your Downloads folder.
  4. How to Open an Acsm File on PC or Mac Picture 14How to Open an Acsm File on PC or Mac Picture 14
    Double-click the installer package. It's called Digital Editions 4.5 Installer.pkg (version number may vary).
  5. How to Open an Acsm File on PC or Mac Picture 15How to Open an Acsm File on PC or Mac Picture 15
    Follow the on-screen instructions to install the app. Start by clicking Continue, then go through each screen until the application is installed.
    1. You'll have to enter the admin password toward the end of the installation.
  6. How to Open an Acsm File on PC or Mac Picture 16How to Open an Acsm File on PC or Mac Picture 16
    Open Finder
    How to Open an Acsm File on PC or Mac Picture 17How to Open an Acsm File on PC or Mac Picture 17
    . It's in the Dock, which is usually at the bottom of the screen.
  7. How to Open an Acsm File on PC or Mac Picture 18How to Open an Acsm File on PC or Mac Picture 18
    Open the folder that contains the .acsm file.
  8. How to Open an Acsm File on PC or Mac Picture 19How to Open an Acsm File on PC or Mac Picture 19
    Hold the Control key as you click the file. A context menu will appear.
  9. How to Open an Acsm File on PC or Mac Picture 20How to Open an Acsm File on PC or Mac Picture 20
    Click Open With.
  10. How to Open an Acsm File on PC or Mac Picture 21How to Open an Acsm File on PC or Mac Picture 21
    Click Adobe Digital Editions. This opens the .acsm file in Adobe Digital Editions.
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