However, there is a legitimate way to access it if you are a returning user. maintains a Legacy Products page

Ozone 4 was released in . While it introduced groundbreaking features like Mid/Side processing and the "Intelligent II" limiter, it lacks compatibility with modern operating systems and DAWs (Digital Audio Workstations). Izotope Ozone 4 - Gearspace

If you need a free mastering suite that works on modern computers (Windows 10/11, macOS Big Sur/Ventura), these legal alternatives are superior to using outdated legacy software.

If you want the iZotope sound without the price tag, consider these official options:

Released in 2008, Ozone 4 was a landmark in music production. It was one of the first "all-in-one" mastering suites that allowed independent artists to achieve radio-ready polish without a million-dollar studio.