It looks like there’s a conflict with the Mac system permissions. Please follow the instructions below to fix this.
Get a new installer from the downloads page directly. Download
In MacOS System Settings > Privacy & Security > Full Disk Access, enable full disk access for Installer if it is not enabled already.
Then, go to Privacy & Security > Files and Folders, enable the Downloads folder for Installer.
Run the installer and let me know what happens.
If that doesn’t work, please submit a support ticket at support.topazlabs.com with the support beacon on the bottom right corner of the page so we can take a closer look at your specific computer.