Hi Mars,
Our developers were made aware of the issue with the installer and have since updated the download link for the latest SmarterMail with a fix. If you go through the upgrade process again, but use a fresh download of SmarterMail, the issue should be fixed. If you continue to have any problems I recommend opening a ticket with the support department so they can look into this further for you.
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com