The latest version of nero is 6. Why would you have to install from scratch anyway? The page you point to states that "The update CANNOT be used for upgrading to a higher Nero version (e.g. not from Nero 5 to Nero 6), just to update to the latest available version within one sequence: e.g. from Nero 126.96.36.199 to Nero 188.8.131.52" so version 5 is updateable with version 5 updates. If you download the wrong file it will tell you anyway.