TROUBLESHOOT
VOCALOID6
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 the steps listed in "If you want to open an app that hasn’t been notarized or is from an unidentified developer" on the official Apple support site.
(https://support.apple.com/en-us/HT202491)If you are unable to find a solution in the Troubleshooting section, please use the Inquiry Form to submit an inquiry.