how to revert itunes?

1. uninstall the new version.
2. search the old version at apple.com
3. follow this instruction, http://www.jailbreakmovies.com/2011/06/08/how-to-fix-the-itunes-library-itl-cannot-be-read-because-it-was-created-by-a-newer-version-of-itunes-error/