Installing Update
From the product key retrieval page I downloaded Fences 3.0.8.1 and installed it ok.
However when I started Fences I received a note saying that there was an update available.
I downloaded this update but on trying to install it I received the following two messages 
Then the installer closes.
I am not running any uninstall software therefor I do not understand the messages.
I have also tried installing fences in Safe Mode with the same results.
Can anyone help ?