When installing some of your iZotope plug-ins on macOS 10.13 High Sierra or 10.14 Mojave you may receive a warning error stating that “This Application is not optimized for your Mac”.
This error is triggered because all iZotope products use the same installer application which is 32 bit. So even though your plug-ins likely include 64 bit versions you will see this message once during installation. This will not prevent you from installing or using your plug-ins, simply click “OK” to continue and your software will install normally.
If you'd like to learn more about this error, here is Apple’s knowledge-base article regarding this message: