When you try launch Acrobat after it has been installed as part of a Creative Suite 4 package, it prompts you to enter a serial number. Acrobat doesn't accept the Creative Suite 4 serial number.
Solution 1: Uninstall Creative Suite 4 and any stand-alone installations of Acrobat 9. Then delete the activation database files.
- On Windows, choose Start > Control Panel, and choose Add Or Remove Programs. Select Creative Suite 4, and click Remove.
- On Mac OS, navigate to a CS4 application folder (for example, /Applications/Adobe Photoshop CS4). Double-click the "Uninstall Adobe [product] CS4" shortcut, and remove the entire Creative Suite 4 package.
- Windows: \Program Files\Common Files\Adobe\Adobe PCD
\Program Files\Common Files\Adobe\caps\caps.db
- Mac OS: /Library/Application Support/Adobe/Adobe PCD
For instructions, see Resolve installation problems with CS5 Cleaner Tool | CS5.5, CS5, CS4, CS3.
Solution 3 (Windows only): Uninstall Acrobat, remove the Acrobat serial number, and reinstall Acrobat.
Disclaimer: This procedure involves editing the Windows registry. Adobe doesn't provide support for editing the registry, which contains critical system and application information. Make sure to back up the registry before editing it. For more information about the registry, see the Windows documentation or contact Microsoft.
If you previously installed Acrobat, then the serial number and activation information that was used during that installation is retained on your computer. This residual activation information conflicts with the activation of the newly installed version. It's necessary to remove the residual activation information from the previous Acrobat installation.