Hi there!
Here's the link to the instructions on how to upgrade SmarterMail:
Major Upgrade of SmarterMail. This can be found in our Knowledge Base. If you click on the Knowledge Base link up above you'll find a lot of helpful information and instructions that will help you out with your SmarterMail install.
Hope this helps!
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com