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Also for Voclaoid 2. Dramatic changes to the engine between Vocaloids meant sometimes certain engine versions didn't work well with each other. All the legit version needed was the re-installation of the most current Vocaloid if there was a problem with some Vocaloids.

In 2, some vocaloids need to be in order like Luka, I think but I believe that's only for fake ones though it does happen to legits.