How to upgrade Wildfire 3.1.0 to newest version of Openfire

I am looking for instructions and links to the software to upgrade a RedHat install of Wildfire 3.1.0 to the newest version of Openfire. The upgrade states going from Wildfire 3.2.4 but does not provide a correct link to upgrade from an older version of Wildfire. Also need links to the older versions of Wildfire to upgrade with.

Does anyone have a list or spreadsheet of changes to show my boss of why upgrade and changes made to the sofware?

thanks