ScreenFlow 10: Unable to activate serial number

I've been using ScreenFlow for a few years without any issues. When upgrading to ScreenFlow 10.0.3 I'm now running into a problem activating my serial number (newly purchased upgrade).


When I go to activate I get the following message displayed:

Unable to activate serial number

The system did not authorize the privileged operation.  Please quit the application and try again.  The error code was -2002.


I've added Full Disk access to ScreenFlow so not sure what the installer is trying to do that would require further access.


macOS Big Sur: Version 11.5

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