The security settings on my Mac will not allow me to install VocALign. How can I resolve this?

VocALign Project 3 or VocALign Pro 4 are older, discontinued plugins that are no longer supported.

For greatly improved alignment performance, we do recommend to upgrade to VocAlign Project 5 and VocAlign Ultra: upgrades are available in the Synchro Arts online Store

On recent Mac computers, the installation of VocALign Project 3 or VocALign Pro 4 may fail.
However, you may be able to complete their installation.

Please review the steps suggested in this article or this article, as they may help you.

Also, normally you can override any security warning in the Security & Privacy control panel in your macOS System Preferences, in the General pane, as shown in this image: