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You may see the following message when opening a VocALign installer or launching Revoice Pro 4 software on macOS 10.15 Catalina:

"VocALign ProjectAU.pkg" can't be opened
because Apple cannot check it for malicious
The software needs to be updated. Contact the
developer for more information.

To avoid this message right click (or context click) on the installer (or Revoice Pro 4 application icon)

Select Open and the following screen will be shown.

Select Open and the installer will then run.