You can install Adobe Digital Editions 4.0 in Mac OS X by following the steps below:
Adobe Air Driver
Navigate to http://www.adobe.com/in/products/digital-editions.html
Click Download tab. Downloads page for Adobe Digital Editions appears.
Click Download Digital Edition 4.0 Macintosh (18.7 MB)
ADE_4.0_Installer.dmg file downloads to your computer.
Double-click ADE_4.0_Installer.dmg file from your computer, to start the installation process.
Select the destination for the drive where you want to install Adobe Digital Editions. Digital Editions only installs on the drive where Mac OS is installed. Once you have selected the destination, click Continue.
Mac OS X asks that you authorize the installation. Enter an administrator account name and password to authorize the installation.
If you have difficulties with the installation process, see Can’t Install Adobe Digital Editions
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