is the central application used to manage, download, and authorize all iZotope software. If you already own a license, logging into the portal may allow you to see and download your authorized legacy versions. Compatibility Warnings
: Supports AU, VST, VST3, and AAX (legacy versions). Installation Tips Legacy Products - iZotope
Ozone 5 was released during the transition period from macOS Snow Leopard to Mountain Lion.
The most reliable way is through the iZotope Legacy Products page