Error "custactutil can't be opened because its integrity cannot be verified" on macOS Catalina 10.15

Published: 29 Aug 2019
Last Modified Date: 22 Oct 2019


When running custactutil and other FNP licensing tools on macOS Catalina 10.15, the following error message is displayed:
custactutil can't be opened because its integrity cannot be verified. This software needs to be updated. Contact the developer for more information.


  • Tableau Desktop and Tableau Prep Builder versions 2019.3 and earlier
  • macOS Catalina 10.15 and later versions


Grant permission to custactutil and custactutil_libFNP.dylib as follows:
  1. Click Cancel to dismiss the warning dialog.
    Note: Do not click Move to Trash.
  2. Open the Security & Privacy pane in System Preferences.
  3. At the bottom of the pane, the message "custactutil was blocked from use because it is not from an identified developer" is displayed. Click the Allow Anyway button.
  4. Run custactutil again.
  5. The warning message is displayed for a second time, but now an Open button displays. Click Open.
  6. The warning message displays for a third time, this time referencing custactutil_libFNP.dylib and offering options to Move to Trash or Cancel. Click Cancel.
  7. Go back to the Security & Privacy pane and click Allow Anyway for this library file.
  8. Run custactutil again. 
  9. The warning message will be displayed for a fourth time. click the Open button.


This behavior is related to a known issue with ID 953649 which is currently under investigation. 
Apple has new requirements for software to run on macOS Catalina. 
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