Installer was unable to copy a critical file/directory (Error code: 42 or 72)

While installing or updating the Adobe Creative Cloud desktop application, you receive an error, "Installer was unable to access a critical file/directory. Please try installing again." (Error Code: 42) or (Error Code: 72)




This error occurs when Windows is not able to validate digital certificates because the OS is not up to date.


Install all available Windows updates.

Additional Information

Check the ACC.log

  1. Navigate to C:\Users\[User Name]\AppData\Local\Temp\CreativeCloud\ACC
  2. Open ACC.log and look for the following: | [ERROR] | | ACC | LBS | WorkflowManager | | | 7248 | PIM Validation Failed:Process certificate didnt match to Adobe certificate! CANameChain:


Some files and folders are hidden on Windows. See Show hidden files, folders, filename extensions | Windows XP, Vista, Windows 7, 8 for more information.

Check the certificate

  1. Navigate to C:\Program Files (x86)\Adobe\Adobe Creative Cloud\ACC.
  2. Right-click Creative Cloud.exe and click Properties.
  3. Go to the Digital Signatures tab and click the Details button.
  4. The message This digital signature is OK appears under Digital Signature Information. Any other message causes Error 42 or 72 to occur. 

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