Hello Frank,
Thanks for the inquiry. You may follow the same steps as noted in the Knowledge Base article for upgrading a major version of SmarterStats. Please keep in mind that we recommend making a backup of the directories and folders that pertain to the previous installation. You may need to make an additional backup of the IIS logs as well.
If you choose to upgrade to a newer build, such as the SmarterStats 9x or 10x then we suggest to implement at least the 8x build first to see if there are any issues.
Thank You.