How to Open an Acsm File on PC or Mac

Windows

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. 
   Press ⊞ Win+E. This opens the File Explorer.
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. 
   Right-click the .acsm file. A context menu will appear.
5. 
   Select Open with…. Another menu will expand.
6. 
   Click Adobe Digital Editions. An authorization screen will appear.
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. 
   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. 
   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. 
    Click OK. You can now read the .acsm file in Adobe Digital Editions.