Instead of risking your system with an outdated crack, you can build a powerful, modern mastering chain using 100% free, legal VST plugins. These alternatives match or exceed the performance of the vintage Ozone 4 modules: 1. Mastering Limiters

Enabled independent processing of the center information (vocals, kick, bass) and side information (guitars, wide synths, reverb).

Tokyo Dawn Labs offers some of the cleanest, most transparent free mastering plugins available: