However, using an old, cracked build ("k'd") on a modern system is a recipe for instability, potential malware, and a subpar workflow. The plugin itself deserves 4/5 stars for its historical impact, but the specific file you have found is best left in the archives.
The filename specifies . This is important. The "Standard" version of Ozone 5 locked many parameters. The Advanced version unlocked: izotope ozone 5 advanced v505b macosx k 39d free