replied on August 27, 2021
In my experience going from 9 to 10 simply requires running the wizards, I have done it nearly 100 times with very few issues. Only difference is that the version 10 installers require more manual steps compared to the version 9 installers. IE: ending task on processes, stopping services, and renaming a file in the workflow folder, but they will step you through each thing.
If you don't have the original version 9 installers (to roll back with, using backups of the databases) then you might want to start with a new operating system so that you can roll back to the original. I have only ever had to roll back once or twice.