From your post above:
I then downloaded the updated setup file.
The installation failed.
Sonic Boom told you not to download the file!
This is what I did (from the string above)
02/18/12 13:52:53 - Checking if there is a newer version of setup available to download
02/18/12 13:52:56 - The version of setup available on the update site is: 188.8.131.52, and will be downloaded
02/18/12 13:52:56 - Downloading file from 'http://docs.roxio.co...8b48a/setup.exe'
When I ran the installation, I did not download updates !!!!!!!!!!!!!!