VOCALOID5 installers don't run on macOS 10.15 Catalina .(Mac)

If you attempt to install any VOCALOID products using the product's installer/updater, a warning message may appear. If you cannot open the installer/updater, please try following the steps listed in "How to open an app that hasn’t been notarized or is from an unidentified developer" on the official Apple support site.

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