Quote from OrphisIn order to make ExperienceFu (and others Fubar addons like DurabilityFu) work, I have edited the .toc file in the addon and changed the version from 20400 to 30000. Then it works fine with no other change at all.
Tested and certified on my setup and a friends setup which is really different from mine.
You shouldn't need to edit .toc files to make addons work. Just check the "Load Outdated Addons" options from the addons button on your character selection screen.