When attempting to run the DPAPI_KeyUtility, a pop-up window displays a Microsoft.Net Framework error:
Application attempted to perform an operation not allowed by the security policy
Note: This will occur even if the user you are logged in as a member of the local Administrator's group, e.g. the user you are installing Director as.
Attempting to export the DPAPI key as a user other than Administrator or a user that doesn't have access to the Microsoft.Net Framework application.
Right click on DPAPI_KeyUtility.exe and select Run as Administrator. Enter the credentials for the local administrator if prompted. The key should then be exported correctly.