I found that with the 6.x Professional version you can install it. Take a Before snapshot on a clean machine paste the directory onto the machine, create a shortcut to the executable, take an After snapshot, and compile the MSI. Uncheck the Dialogs for a silent install.
Lavasoft does have an already built msi version of their Professional product available. We asked about it and then were sent a link where to get it from.
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