Your OS may not support TLS 1.2 encryption protocol used to authorize VOCALOID products.
Please upgrade your OS to Windows 8.1 or later that supports TLS 1.2.
Please upgrade your OS to macOS 10.15 Catalina or later that supports TLS 1.2.
You also need to update VOCALOID License Manager to version 4.5.0.
If you are unable to find a solution in the Troubleshooting section, please use the Inquiry Form to submit an inquiry.