Fences 6 upgrade from 5 generates File version mismatch error

I've upgraded from Fences 5 to Fences 6 and I get the above error message when trying to configure the app. I am on Windows 11 Home 10.0.26200 Build 26200 and am using BitDefender anti-virus. I have restarted the computer and reinstalled the upgrade several times and the same error occurs.